User Manual - Studio Manuals
Contents
1. External switch or relay contact NOTE Both switch contacts must be isolated from ground and other functions 10 Symetrix 371 SPL Computer User s Guide Making Hardware Connections Overview of Rear Panel Connectors Sensing Microphone Considerations 371 Basic Connection Connecting a Remote Volume Control Connecting a Switch for External Ducking Control Input and Output Connector Input and Output Connector Wiring Wiring Input Connections These connectors are designed for use with bare wire Do not tin stranded wires before inserting them into the connectors For Unbalanced Connections Connect the input terminal to the source ground at the source Feeding unbalanced inputs directly from balanced outputs is not recom mended due to the possibility of ground loops You may want to use the Symetrix 307 isolation trans former to break the ground connec tion and eliminate the ground loop Output Connections These connectors deliver a differen tial balanced output signal mimics a grounded center tap transformer winding For Unbalanced Loads With unbalanced loads it is prefera ble to carry the low side of the input all the way back to the ground connection of the source Use the output terminal and the ground terminal Ignore float the output terminal Balanced Terminal Strip Balanced Female XLR Pin 1 Not Connected Pin 2 High Pin 32. WARNING ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE RISQUE DE CHOC ELECTRIQUE AVIS NE PAS OUVRIR SEE OWNERS MANUAL VOIR CAHIER D INSTRUCTIONS o user serviceable parts inside Refer servicing to qualified service personnel Il ne se trouve a l interieur aucune piece pourvant entre repar e l usager S adresser a un reparateur comp tent The lightning flash with arrowhead symbol within an equilateral trian gle is intended to alert the user of the presence of uninsulated dan gerous voltage within the product s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons The excla mation point within an equilateral triangle is intended to alert the user of the presence of important operat ing and maintenance servicing instructions in the literature accom panying the product i e this user guide CAUTION To prevent electric shock do not use the polarized plug supplied with the unit with any extension cord recep tacle or other outlet unless the prongs can be fully inserted Symetrix 371 SPL Computer User s Guide Product Summary and Features THE SYMETRIX 371 SPL COMPUTER automatically raises and APPLICATIONS lowers sound system levels in response to changes in ambient noise Restaurants conditions Designed for installations featuring foreground music Retail Shops and or paging it ensures that music and announcements are always
3. Output Maximum Input Level 20 dBu balanced 20 dBu unbalanced Program Input Impedance gt 20 k ohms balanced gt 10 k ohms unbalanced Input Common Mode Rejection Ratio gt 40 dB line inputs Maximum Output Level 26 dBu balanced 20 k ohm load 22 dBm balanced 600 ohm load Output Impedance 200 ohms balanced 100 ohms unbalanced Performance Data Program Frequency Response 20 Hz to 20 kHz 0 1 dB Program Path THD N lt 0 025 4 dBu in 4 dBu out Output Gain Range 20 30 dB Sense Channel Frequency Response 3 db at 300 Hz and 6000 Hz 3 pole Butterworth Sense Channel Gain selectable 0 dB to 70 dB Additional Headphone Monitor Gain 28 dB maximum Program Channel Output Noise 95 dBu unity gain typical Output Trim Range 10 dB Connections Line Inputs Sense Input Ducker Control Remote Gain Line Outputs Euroblock Power In 7 pin DIN Headphone 1 4 in TRS will drive mono or stereo headphones Physical Size H x W x D 1 2 rack unit 1 75 in x 8 5 in x 6 5 in 4 445 cm x 21 59 cm x 15 875 cm Shipping Weight 4 5 lbs 2 03 kg Electrical Power Requirements 10 W maximum Symetrix PS 3 or PS 3E only PS 3 115 V 60 Hz AC nominal PS 3E 230 V 50 Hz to 60 Hz AC nominal In the interest of continuous product improvement Symetrix Inc reserves the right to alter change or modify these specifications without prior notice For the latest specifications visit symetrixaudio com Go to the product page for the 371 SPL Computer 22 S
4. locale Use only a cord that is in good condition Protect the power cord from being walked on or pinched particularly at the plug convenience receptacle and the point where the cord exits from the apparatus Operating Location Do not oper ate this equipment under any of the following conditions explosive atmospheres in wet locations in inclement weather improper or unknown AC mains voltage or if improperly fused Do not install near any heat source such as radiators heat registers stoves or other apparatus including amplifiers that produce heat Unplug this apparatus during lightning storms or when unused for long periods of time Stay Out of the Box To avoid personal injury or worse do not remove the product covers or pan els Do not operate the product without the covers and panels prop erly installed Only use accessories specified by the manufacturer Clean only with a damp cloth User Serviceable Parts There are no user serviceable parts inside the 371 In case of failure refer all ser vicing to the factory Servicing is required when the 371 has been damaged in any way such as when a power supply cord or plug is dam aged liquid has been spilled or objects have fallen into the appara tus the apparatus has been exposed to rain or moisture does not operate normally or has been dropped Equipment Markings Awa A RISK OF ELECTRIC SHOCK DO NOT OPEN TO REDUCE THE RISK OF FIRE OR
5. our examination discloses to our satis faction to be thus defective provided that Buyer gives Symetrix prompt notice of its warranty claim and satisfactory proof thereof Symetrix will make every reasonable effort to ensure that parts are available to support the repair of our products under warranty In the event that a product or component part thereof becomes obsolete unavailable or irrepa rable Symetrix reserves the right to refund a prorated portion of the pur chase price in full satisfaction of all war ranty claims In order to serve you better we require that the Buyer shall prior to shipping Product to Symetrix for warranty ser vice contact Symetrix and secure a Return Authorization Number that shall be included with the returned Product This will facilitate our efforts to keep track of your Product and process your warranty repair as quickly as possible Buyer will prepay all freight charges to ship the Product to Symetrix for war ranty inspection and service This war ranty is subject to Symetrix s inspection of the Product at its facilities and upon Symetrix s request satisfactory proof of purchase dated copy of original retail dealer s invoice Symetrix reserves the right to effect repairs to the product with reconditioned components parts Products once repaired under warranty will be shipped to Buyer freight prepaid by Symetrix via United Parcel Service surface or any similar shipper to any lo
6. the ambient To avoid this choose a higher closer to 0 dB minimum gain and or a higher ratio REQUIRED E RECOMMENDED OPTIONAL 16 Symetrix 371 SPL Computer User s Guide System Setup Overview of Front Panel How System Setup Works Checklist of Tasks Description of Menu Options Description of Menu Options continued PRESS NEXT TO SELECT MENU FEATURE TURN ADJUST TO SELECT VALUE OR CHOICE DESCRIPTION Ducker Depth 0 dB to 40 dB To set the ducking range Upon ducking the program outputs drop according to the value selected External DUCKER CONTROL signal does not mix with internal program signal The external control signal merely ini tiates ducking action Ducker Threshold 20 dB to 30 dB To set the minimum signal level needed for the 371 to acknowledge ducking input The 371 program outputs drop to the Ducker Depth if the DUCKER CONTROL input rises above the Ducker Threshold m Setup Unlocked Unlocked Locked Choose to protect front panel LCD menu settings from being altered To lock press and hold CAL while turning ADJ UST Once it s locked pressing NEXT shows the current settings Any attempt to alter settings results in the display of the message Setup is Locked To unlock press NEXT until the display reads Setup is Locked Press and hold CAL while turning ADJ UST The front panel is now unlocked REQUIRED E RECOMMENDED OPTIO
7. Compressor Limiter Expander 571 SPL Computer 571S SPL Computer Slave 581E Distribution Amplifier 4x4 606 Delay F x Machine 610 Broadcast Audio Delay 628 Digital Voice Processor 9022 2x2 DSP Engine HR 1 Headphone Remote for 304 and 506E RC 1 628 Remote Control RC 2 Remote Control RC 3 Remote Control RC 610 Remote Control
8. PROBABLE CAUSE WHAT TO DO No output signal Check to see that the LCD display is illuminated and the unit is plugged in Check cables and connections to see if Outputs are driving inputs and inputs are fed from outputs Signal is coming from the source s and that it is getting to the 371 The signal chain after the 371 is functioning Unit will not calibrate Check that input levels are normal Use headphones to hear what the 371 reads Check Sense Input Gain to to see if the setting is between 45 dB and 20 dB Calibration will fail if it is below or above these levels Check sensing microphone connections Enable Phantom Power if you are using a microphone that requires it Music always plays too loud Check levels in Set MIN Limit Check if the level is set too high in the Gain Sense Ratio Check in calibration if the maximum limit in Adjust to Maximum is set too high Unit seems to have no effect Check the ratio setting for Gain Sense Ratio At 0 5 1 the gain changes are very subtle Choose a larger value for more change Check the bargraph in Sense to see if the sense level is always the same because then the gain will always be the same See if it s in HISTORY or BYPASS mode Unit does not control levels as expected Using headphones connected to the front panel headphone jack listen to the sense signal to verify that the SENSE INPUT is receiving a signal that accu rately represents ambie
9. chassis of the 371 Indicates menu option in the 371 LCD display Indicates where you will find additional information Symetrix 371 SPL Computer User s Guide Before You Begin What Ships in the Box Getting Help Optional Accessories Notational Con ventions in this User Guide Operator Safety Summary Equipment Markings Operator Safety Summary Follow all warnings and instructions Install in accordance with the man ufacturer s instructions Power Source This product is intended to operate from a Symetrix PS 3 or PS 3E power supply Grounding The chassis of this product is grounded through the grounding conductor of the PS 3 or PS 3E power cord To avoid electric shock plug the power cord into a properly wired receptacle before making any connections to the product A protective ground con nection by way of the grounding conductor in the power cord is essential for safe operation Do not defeat the safety purpose of the grounding plug The three pronged grounded plug is provided for your safety When the provided plug does not fit your outlet consult an elec trician for replacement of the obsolete outlet Danger from Loss of Ground If the protective ground connection is lost all accessible conductive parts including knobs and controls that may appear to be insulated can render an electric shock Proper Power Cord Use only the power cord and connector specified for the product and your operating
10. kHz 0 1 dB with THD N less than 0 25 at 4 dBu over the same range of frequencies The output noise of the device shall be less than 95 dBu 20 kHz noise bandwidth unity gain The input and output configuration shall be active bal anced 23 In addition to the audio input output connections there shall be connections provided for a sense input and remote trim control A front panel power indicator shall be provided A liquid crystal display shall be provided to communicate operat ing parameters and setup information with the user The ALC shall occupy half of the width of one rack space and shall be housed in a metal enclosure It shall use an external safety agency approved power supply The Ambient Level Controller shall be the Symetrix model 371 SPL Computer Symetrix 371 SPL Computer User s Guide Following are the terms and limitations of the Symetrix warranty Symetrix Inc expressly warrants to the original purchaser Buyer subject to the terms and conditions set forth below that the Product will be free from defects in material and workmanship as a result of normal commercial use for one 1 year from the date of purchase Symetrix s warranty obligation is limited to the repair replacement or refund at Symetrix s sole discretion of the part or parts of the Product which may thus prove defective in materials or work manship within one year from date of purchase under normal use and which
11. to hear the ambient sound within the controlled space It is vital that you place the microphone where it pri marily picks up a majority of noise rather than the paging or music that is going through the system Do not locate the sensing micro phone near a localized noise source that is not typical of the ambient noise level of the controlled zone for example the noise from a large machine of some sort or maybe a kids play area or a video game If you do this the 371 will think that the zone is noisier than it really is The best sense mic placement ensures that the majority of the signal picked up by the sensing microphone is ambient noise AmbiSense allows music or page pickup without any ill effects on its operation up to about a 50 50 mix of music page to ambient In an extreme case where the sense microphone picks up 100 music page 0 ambient noise AmbiSense will not be able to extract enough information to use for gain control Capability of Sound Sys tem to Match the Maxi mum Required Level Calibrate at a quiet to average time in the controlled space It helps if you have an estimate sound pres sure level of the maximum desired level Check the sound system to see that it is capable of delivering that level Symetrix 371 SPL Computer User s Guide Making Hardware Connections Overview of Rear Panel Connectors Sensing Microphone Considerations 371 Basic Connection Connecting a Remote Vo
12. you send us your product in substandard packaging we will charge you for you only one way freight charges factory shipping materials If you don t have the factory packaging materials We ll prepay the return surface do the following freight Of course if the repair is due to operator error parts and labor will be charged If there are 2 Wrap the unit in a plastic bag and surround it with bubble wrap charges for the repair costs you will pay for the return freight All charges will be COD unless you have made other arrangements prepaid We will return the unit in Symetrix packaging Visa or Mastercard 1 Select an oversized carton 3 Pack the box full of Styrofoam peanuts Be sure there is enough clearance in the carton to protect the rack ears Out of Warranty Repairs If the warranty period has passed you ll be billed for all necessary parts labor packaging materials and freight charges Symetrix 371 SPL Computer User s Guide Declaration of Conformity We Symetrix Inc 14926 35th Ave West Lynnwood Washington USA declare under our sole responsibility that the product 371 SPL Computer to which this declaration relates is in conformity with the following standards EN55103 1 Electromagnetic compatibility Product family standard for audio video audio visual and entertainment lighting control apparatus for professional use Part 1 Emission EN 55103 2 Electromagnetic compatibil
13. 0 dB You can also check the SENSE INPUT by listening with headphones connected to AMBIENT SENSE MONITOR on the front panel to hear what the 371 is reading What You Should Not Do After Calibration Do not adjust the level of any vol ume controls in the sound system signal path after the 371 Doing so will cause the AmbiSense technol ogy to yield erroneous results Con trols that must remain fixed include amplifier input level controls wall mounted L Pad style speaker atten uators etc Also do not insert compressors or limiters into the signal path after the 371 If you need to adjust amplifier input levels re calibrate the 371 afterward to reset the data collected by the AmbiSense algo rithm If you need to trim the over all system level up or down after calibration you can do this by adjusting the Output Trim Symetrix 371 SPL Computer User s Guide Signal Flow Diagram LINE e BAL INPUT gt LEFT LINE e BAL INPUT H gt RIGHT S DUCK S AVERAGE PAGE 6 BAL LEVEL TRIGGER INPUT DETECT input O REMOTE an S TRIM PHANTOM POWER INPUT GAIN SENSE io SENSE 9 VCA gt _ 51 LINE OUTPUT tert 8 RMS DETECT VCA gt JF LINE OUTPUT RIGHT NN ADJUST SPL a CPU ao O CALIBRATE ne MENU EXIT oe MENU NEXT RMS DETECT BANDPASS PEN ae SENSE FILTER HEADPHONE VOLUME 19 SYMPTOM Symetrix 371 SPL Computer User s Guide Troubleshooting
14. 371 is permitted to have History Reset to Zero Displays numeric readings of the highest and lowest SPLs from whenever the 371 unit was calibrated or from when the setting was last reset Resetting the 371 to Zero starts a new history period where the 371 begins to collect the highest and lowest relative SPL readings Sense Displays bargraph of current ambient noise level Phantom Power ON 15 V OFF To turn on or off 15 V phantom power for the sense microphone Enable only if your microphone requires it e Sense Input Gain 0 10 20 30 40 50 Select the amount of gain that is 60 70 dB required for the sense microphone For proper calibration the internal preamp must produce a signal in the range of 45 dB to 20 dB Refer to Sense for relative SPL readings REQUIRED E RECOMMENDED OPTIONAL 15 Symetrix 371 SPL Computer User s Guide System Setup How System Setup Works Description of Menu Options Overview of Front Panel Checklist of Tasks Description of Menu Options continued PRESS NEXT TO SELECT MENU FEATURE TURN ADJUST TO SELECT VALUE OR CHOICE DESCRIPTION Output Trim 10 dB to 10 dB in 1 dB increments To add to or subtract from the overall output gain Remote To control the output trim with a potenti ometer or with the RC 3 Remote Control Keep gain in 10 dB to 10 dB range for accurate operation However a remote pot can dim t
15. ENGINEERED SOUND 371 SPL COMPUTER 371 SPL Computer Symetrix USER S GUIDE RevB 02 What s Inside Before You Begin What Ships in the Box Getting Help Optional Accessories Notational Conventions in this User Guide Operator Safety Summary Equipment Markings Product Summary and Features Checklist of Tasks for Hardware Connections and System Setup Making Hardware Connections Overview of Rear Panel Connectors Sensing Microphone Considerations 371 Basic Connections Connecting a Remote Volume Control External Ducking Control Input and Output Connector Wiring System Setup Overview of Front Panel How System Setup Works Checklist of Tasks Description of Menu Options A WWNNNDN N oono u 10 11 12 12 13 13 14 Calibration What Does Calibration Do What to Do Before Calibration How to Calibrate What to Do if your Calibration is Unsuccessful What You Should Not Do After Calibration Signal Flow Diagram Troubleshooting Hardware Specifications Architects and Engineers Specifications Warranty Service Where to Get Service In Warranty Repairs Out of Warranty Repairs To Have Your 371 Repaired If You Don t Have Factory Packaging Materials Declaration of Conformity Copyright Information 18 18 18 18 18 18 19 20 22 23 24 25 25 25 25 25 25 26 27 Symetrix 371 SPL Computer User s Guide Before You Begin What Ships in the Box Getting Hel
16. Low Shield Tab Not Connected Balanced TRS Plug Tip High Ring Low Sleeve Shield Unbalanced TS Plug Tip High Sleeve Low Shield Unbalanced RCA Plug Tip High Sleeve Low Wire Shield Not Connected Balanced Male XLR Pin 1 Circuit Ground Pin 2 High Pin 3 Low Unbalanced TS Plug Tip High Sleeve Shield Wire Low Not Connected 11 CONNECTOR CHANNEL a tot Input all pe h Input mim roA Input mim TIP h Input nr SLEEVE Ap t Input ma ma h Output mim aot Output Symetrix 371 SPL Computer User s Guide System Setup Overview of Front Panel How System Setup Works Checklist of Tasks Description of Menu Options SETUP NEXT 371 SPL COMPUTER Overview of Front Panel AMBIENT SENSE MONITOR CONTROL CONTROL TYPE WHAT IT DOES SETUP LCD menu display Two lines show levels and settings of selected menu option NEXT From normal operation the first press enters the setup mode sub sequent presses step through the setup process and save settings EXIT Exits the setup mode and saves changes to settings The unit reverts to normal operation ADJ UST Turn to chan
17. NAL 17 Symetrix 371 SPL Computer User s Guide What Does Calibration Do What to Do if Calibration Fails What Does Calibra tion Do The calibration process correlates the current ambient noise level to 0 dB unity gain As the ambient SPL becomes less the 371 lowers its gain Conversely when the SPL increases the gain of the 371 increases Proper calibration is vital to the proper operation of the 371 The AmbiSense algorithm will not func tion correctly if the calibration pro cedures are not executed What To Do Before Calibration Before calibration setup the SENSE INPUT System setup menu items that control the Sense Input are Phantom Power and Sense Input Gain THIS I S IMPORTANT e Calibrate when the ambient noise in the area being controlled is at a level typical of normal conditions e Use the highest paging or music input levels that you are likely to encounter during normal opera tion Adjust Sense I nput Gain until Sense displays a bargraph showing a mid level sense signal Make sure you leave enough headroom so that increased ambient levels do not overdrive the sense input For example if you expect that ambient noise levels will rise 20 dB above the currently observed levels adjust the Sense Input Gain to leave more than 20 dB of headroom under current conditions Only perform calibration when the setup for the 371 is unlocked See System Setup gt Description of Menu Optio
18. Setup CALI BRATION e Adjust to Maximum set the desired maxi mum 371 gain 0 20dB Symetrix 371 SPL Computer User s Guide Making Hardware Connections Overview of Rear Panel Connectors Sensing Microphone Considerations 371 Basic Connection Connecting a Remote Volume Control Connecting a Switch for External Ducking Control Input and Output Connector Wiring REMOTE DUCKER GAIN CONTROL h LINE INPUT RIGHT LEFT h h tl h h h SENSE INPUT b HHH R m Overview of Rear Panel Connectors CONNECTION CONNECTOR TYPE WHAT IT DOES POWER INPUT 7 pin DIN female Accepts power only from Symetrix PS 3 or PS 3E power supply REMOTE GAIN Euroblock Supplies 10 V a ground and a signal input for a remote gain trim control DUCKER CONTROL Euroblock Balanced input for the 371 20 k ohm balanced bridging If connecting unbalanced sources see in this section Input and Out put Connector Wiring LINE OUTPUT Euroblock These connectors deliver a differ ential balanced output at 200 ohm source impedance If connecting unbalanced loads see in this section Input and Out put Connector Wiring LINE INPUT Euroblock Balanced input for the 371 20 k ohm balanced bridging If connecting unbalanced sources see in this section Input and Out put Connector Wiring SENSE INPUT Euroblock Accep
19. Subse quent presses of NEXT change Set Sense I nput Gain men tions an V ttings enu options and save settings Set Output Trim 4 Press NEXT or EXIT to end the setup process save any changes Set MIN Limit made and return the unit to z normal operation Specify Averaging Time or e Specify Gain Sense Ratio Allow 20 minutes of inactivity after which the unit automati cally returns to normal opera tion 5 After setup is complete calibrate the unit See the section Calibration Set Ducker Depth Set Ducker Threshold Lock or Unlock Setup 13 Symetrix 371 SPL Computer User s Guide System Setup Overview of Front Panel Description of Menu Options How System Setup Works Checklist of Tasks Description of Menu Options PRESS NEXT TO SELECT MENU FEATURE TURN ADJ UST TO SELECT VALUE OR CHOICE DESCRIPTION Startup Screen Displays current gain applied by the unit When the 371 senses a signal at the DUCKER INPUT Duck displays e Operating Mode Active Select this mode if you want the 371 to vary the gain of this program channel to match the ambient noise level How Sampling Works The 371 takes SPL measurements every 10 ms through the sensing microphone History Select this mode if you only want the 371 to collect data about the highest and lowest ambient SPL in the installa tion zone s The 371 does not perform any gain con trol in t
20. by any means electronic or mechanical without permission in writing from Symetrix Inc If however your only means of access is electronic permission to print one copy is hereby granted Permission to copy the Architects and Engineers Specificiations for written proposals specifying equipment for sound reinforcement systems is also granted Product names mentioned herein may be trademarks and or registered trademarks of their respective companies AmbiSense is a trademark of Symetrix Inc Symetrix Inc 14926 35th Ave West Lynnwood WA 98037 2303 USA Tel 425 787 3222 Fax 425 787 3211 Web symetrixaudio com Email sales symetrixaudio com symetrixaudio com 301 Low Distortion Compressor Limiter 302 Dual Microphone Preamplifier 303 Interface Amplifier 304 Headphone Amplifier 305 Distribution Amplifier 1x4 306 Preamp Ducker 307 Dual Isolation Transformer 308 VCA Volume Control Loudness EQ 371 SPL Computer 372 SPL Computer 402 Dual Output Delay 420 Stereo Power Amplifier 421M AGC Leveler 422 Stereo AGC Leveler 440 Foreground Audio Controller 450 Dual Zone Priority Mixer 460 Presentation Audio Mixer 501 Peak RMS Compressor Limiter 501 01 Peak RMS Compressor Limiter 506E Headphone Amplifier 527E Voice Processor 528E Voice Processor 531E Graphic Equalizer 532E Graphic Equalizer 533E Graphic Equalizer 551E 5 Band Parametric EQ 552E Dual 5 Band Parametric EQ 562E Windowing Expander Gate 565E Dual
21. cation desig Warranty nated by buyer within the Continental United States At Buyer s request and expense Product will be returned via air freight Outside the continental United States repaired or replaced products will be returned freight collect THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED ARISING BY LAW OR OTH ERWISE INCLUDING WITHOUT LI MITA TION ANY OBLIGATIONS OF THE SELLER WITH RESPECT TO CONSEQUENTIAL DAMAGES INCLUDING THE WARRAN TIES OF MERCHANTABILITY AND FIT NESS FOR USE AND OF ALL OTHER OBLIGATIONS OR LIABILITIES ON OUR PART AND WE NEITHER ASSUME NOR AUTHORIZE ANY OTHER PERSON TO ASSUME FOR US ANY OTHER LIABILITY IN CONNECTION WITH THE SALE OF THE PRODUCT THIS WARRANTY SHALL NOT APPLY TO THIS PRODUCT OR ANY PART THERE OF WHICH HAS BEEN SUB JECT TO ACCIDENT NEGLIGENCE ALTERATION ABUSE OR MISUSE WE MAKE NO WARRANTY WHATSOEVER IN RESPECT TO ACCESSORIES OR PARTS NOT SUPPLIED BY US THE TERM ORIG INAL PURCHASER AS USED IN THIS WARRANTY SHALL BE DEEMED TO MEAN THAT PERSON OR COMPANY THAT ORIG INALLY PURCHASED THE PRODUCT This Symetrix product has been designed and manufactured for use in professional industrial systems and is not intended for other usage This war ranty only applies to Buyers using the Product in professional industrial sys tems With respect to others including but not limited to consumers for per sonal family or household use Sy
22. de clearly audible and distinct but never too loud Proprietary Oitas AmbiSense technology enables the 371 to continuously monitor Transit Stations changing ambient noise levels not just during gaps in the audio program so it can respond quickly to sudden changes Hospitals Factories Uses Microphone for Noise Sensing Uses an external microphone to measure changes in the ambient noise level Continuously Monitors Ambient Noise Levels AmbiSense technology responds to environmental noise changes in real time not just during gaps in audio program Headphone Monitoring Monitor the sense signal using a separate front panel headphone output 3 Operating Modes Active Indicates continuous measurement of the ambient noise level History Displays the lowest and highest SPL readings from when the unit was last reset Bypass Bypasses the unit Audio passes through at unity gain Signal Path Accepts mono or stereo signals via Euroblock connectors Easy Calibration Uses step through menus on the front panel LCD Calibration performed under typical installation conditions No waiting for the quietest or noisiest ambient conditions Ratio Adjustment Choose an adjustment ratio of SPL change vs program level change Sense Signal Measuring Display numeric reading and relative bargraph of the signal appearing at the sense terminals Gain Controls Set minimum and maximum lim
23. ge the selected parameter CAL Press to have the 371 read the current ambient level and equate this reading to O db unity gain Displays the relative ambient reading which it considers as normal CAL is only active in normal oper ating mode and when setup is unlocked AMBIENT SENSE Headphone jack 1 4 inch TRS jack suitable for headphone impedances of 60 ohms or higher stereo or mono Enables listening to the output of the sensing system Helpful for troubleshooting or for figuring out what the 371 sense mic is actually hearing For more information see System Setup gt Description of Menu Options gt Sense MONITOR Adjusts the volume level at the headphone jack 12 Symetrix 371 SPL Computer User s Guide System Setup Overview of Front Panel How System Setup Works Checklist of Tasks Description of Menu Options Checklist of Tasks How System Setup Works Use the two push buttons NEXT REQUIRED RECOMMENDED OPTIONAL MENU OPTION IN LCD DISPLAY and EXIT with the parameter adjustment knob ADJ UST to gain access to menu setup options in the e Choose Operating Mode LCD display View calibration Status 1 Press NEXT to enter the setu A mode p Collect History of highest and lowest SPLs 2 Turn ADJUST to select a specific f value or choice View Sense levels 3 Press NEXT again to gain access Enable Phantom Power to another menu option
24. he audio down to 50 dB temporarily m Set MIN Limit 30 dB up to the actual set ting of the maximum lim int in 1 dB increments To adjust the lowest gain setting that the 371 uses This ensures a known minimum level from the sound system even if the ambient drops to dead silence m Averaging Time 1 3 10 30 seconds 1 5 5 15 minutes To adjust the reaction time at which the 371 adjusts to the ambient level Longer running averages make the sys tem respond more to the trend of the ambient level rather than the most recent events Gain Sense Ratio 0 5 1 1 1 1 5 1 2 1 NOTE The displayed ratio values are guide lines only and not absolute values The AmbiSense algorithm may modify these ratios based upon the data it gathers during the calibra tion process Refers to the change in gain of the 371 versus the change in the ambient 0 5 1 changes gain 0 5 dB for every 1 dB change in the ambient This makes the sound system louder in response to increases in the ambient but never tries to out shout the crowd 1 1 matches gain changes to the ambient noise level 1 5 1 changes gain 1 5 dB for every 1 dB increase in the ambient noise level 2 1 changes gain 2 dB for every 1 dB increase in the ambient noise level NOTES e Ata 2 1 ratio with high ambient lev els the 371 can easily out shout the crowd e At lower ambient levels the 371 might let the sound system get lost in
25. his mode You can determine the start of the history period or collection of data See in this section History to reset or start the collection of the rela tive SPL history Ducking can be made active in this mode if desired Bypass Select this mode when you want to leave the 371 physically connected in the sig nal path only pass the signal unaltered and never take SPL samples This feature is useful if you encounter setup problems in an installation You can temporarily disable the 371 until you have the time to correct the problem Or when the action of the 371 is tempo rarily unwanted for example when an unusual event is taking place You can view your control settings in this mode Any changes you make to your control settings in this mode will not take effect The gain is always held at unity 0 dB in this mode Bypass mode is not a hard wire bypass REQUIRED E RECOMMENDED OPTIONAL 14 Symetrix 371 SPL Computer User s Guide System Setup Overview of Front Panel How System Setup Works Checklist of Tasks Description of Menu Options Description of Menu Options continued TURN ADJUST TO SELECT PRESS NEXT TO SELECT MENU FEATURE VALUE OR CHOICE DESCRIPTION Status Displays the current calibration status of the 371 Cal Ambient signal level measured at the last sense period Min Minimum gain that the 371 is permitted to have Max Maximum gain that the
26. its for SPL gain range Gain range is 30 dB to 20 db Averaging Time Choose integration time of the running average SPL Phantom Power Sense input provides 15 V phantom power to microphone Enable or disable in front panel LCD menu Ducker Control Ducker input provides momentary reduction of program level from 0 dB to 40 dB and inhibits sense operation for the duration of the externally supplied line level ducking control signal Remote Control Option Connect rotary potentiometer or Symetrix RC 3 for remote control of output level Symetrix 371 SPL Computer User s Guide Checklist of Tasks for Hardware Connections System Setup and Calibration REQUIRED RECOMMENDED OPTIONAL TASK TO DO HARDWARE Connect page program input source CONNECTIONS 2 Connect 371 to output device Connect sense microphone Connect input source for ducking Connect remote volume control pot Connect switch for external ducking control Connect to AC power supply Connect headphones to hear what the 371 is sensing SYSTEM SETUP J Choose Operating Mode View calibration Status Collect History of highest and lowest SPLs View Sense levels Enable Phantom Power Set Sense Input Gain Specify Output Trim Set MIN Limit Specify Averaging Time Specify Gain Sense Ratio Set Ducker Depth Set Ducker Threshold Lock or Unlock
27. ity Generic immunity standard Part 1 Residential commercial and light industry PS 3E power supply complies with this code EN 60950 Safety requirements for mains operated electronic and related apparatus for household and similar general use The technical construction file is maintained at Symetrix Inc 14926 35th Avenue West Lynnwood WA 98037 2303 USA The authorized representative located within the European Community is World Marketing Associates P O Box 100 St Austell Cornwall PL26 6YU U K Date of issue January 2001 Place of issue Lynnwood Washington USA Authorized signature Dane Butcher President Symetrix Inc 26 Symetrix 371 SPL Computer User s Guide June 2001 Symetrix Inc All rights reserved Printed in the United States of America Symetrix Part Number 53371 0B02 The information in this guide is subject to change without notice Symetrix Inc shall not be liable for technical or editorial errors or omissions contained herein nor is it liable for incidental or consequential damages resulting from the furnishing performance or use of this material Mention of third party products is for informa tional purposes only and constitutes neither an endorsement nor a recommendation Symetrix assumes no responsibility with regard to the performance or use of these products Under copyright laws no part of this user guide may be reproduced or transmitted in any form or
28. lume Control Connecting a Switch for External Ducking Control Input and Output Connector Wiring 371 Basic Connection Connect your input devices optional 2nd CD player sensing mic sensing mic 5 G TSIEN Connect PS 3 power supply to AC power amp speakers Connect output to amplifiers EQs speakers etc Symetrix 371 SPL Computer User s Guide Making Hardware Connections Overview of Rear Panel Connectors Sensing Microphone Considerations 371 Basic Connection Connecting a Remote Volume Control Connecting a Switch for External Ducking Control Input and Output Connector Wiring Connecting a Remote Volume Control The 371 allows you to have remote gain control You can connect a potentiometer or the Symetrix RC 3 Remote Control to the REMOTE GAIN Euroblock connectors Connect a potentiometer or another device which generates voltage between the 10 V output and ground of the 371 The value of the potentiometer isn t critical anything between 10 k and 100 k linear taper will do For best accuracy use the supplied 10 V reference at Pin 1 of the connector to drive the high side of the potentiometer Enable Remote Control From the LCD menu In order for the remote volume con trol to work you must enable remote control To enable remote control 1 From the LCD menu display select the menu option Output Trim 2 Turn ADJ UST full
29. ly you can choose to attach to the DUCKER CONTROL a momentary switch or relay contact to manually control ducking Such a switch might be a push to talk switch contact within a microphone or a manual switch on a control panel One isolated SPST single pole single throw normally open contact is required To enable ducking you must also set parameters in the LCD menu Set Ducking Parameters in LCD Setup Menu e If you are using audio to control ducking set the Ducker Thresh old between 30 dBu and 20 dBu The correct setting is depen dent up the average level of your incoming signal Experiment until it sounds right to you e If you are using a switch to control ducking then set the Ducker Threshold somewhere between 0 and 10dBu e Set the Ducker Depth for the desired amount of signal attenua tion when ducking is active Ducking takes place whenever the audio ducking signal exceeds the threshold or whenever the switch con tacts are closed depending upon which ducking method you have cho sen Sensing is inhibited while ducking is in process therefore gain remains fixed during the ducking event NOTE e If Ducker Depth is set to zero applying a ducking signal will freeze the gain Line Level Audio Input Signal Cropped Rear Panel View of 371 z Symetrix REMOTE LINE OUTPUT LINE INPUT GAIN RIGHT LEFT RIGHT LEFT ee ee
30. me trix expressly disclaims all warranties including but not limited to warranties of merchantability and fitness for a particu lar purpose and the express warranties as otherwise provided herein Symetrix reserves the right to modify the design or make additions to or improvements to its product lines with out making similar upgrades to Product purchased by Buyer Symetrix does not authorize any third party including any dealer or sales representative to assume any liability effect any repairs or modifications to the Product or make any additional warranties or representa 24 tion regarding the Product or Product information on behalf of Symetrix Symetrix s total liability on any claim whether in contract tort including neg ligence or otherwise arising out of con nected with or resulting from the manufacture sale delivery resale repair replacement or use of Product will not exceed the purchase price of the Product or any part thereof which gives rise to the claim In no event will Syme trix be liable for any incidental or conse quential damages including but not limited to damage for lost revenue cost of capital claims of customers for ser vice interruptions or failure to supply and costs and expenses incurred in con nection with labor overhead transporta tion installation or removal of products or substitute facilities or supply houses as a result of Product failure This limited warrant
31. ns gt Setup Unlocked Pressing CAL when the setup is locked will do nothing What to Do Before Calibration Calibration How to Calibrate What You Should Not Do After Calibration How to Calibrate 1 4 On the front panel press CAL The 371 sets software controlled gain to O dBu unity The LCD menu displays Unity Gain Cal to proceed Adjust the other components in the sound system music level power amp gain etc for the desired program level during average conditions If you wish to continue with cali bration then press CAL again If you do not wish to continue with calibration then press EXIT and the calibration process will abort The 371 reads the ambient level on the SENSE INPUT This level will be the unity reference 0 dB for the 371 When the LCD menu displays Adjust to Maximum turn ADJ UST to set the maximum gain for the program output The gain range is 0 dB to 20 dB in 1 dB steps Next the LCD menu displays whether calibration succeeded or not When calibration is finished the 371 displays the relative ambient SPL reading which it considers as normal 18 What to Do If Calibra tion is Unsuccessful Calibration can fail if the Sense Input Gain is set too low 45 dB or too high 20 dB In the LCD setup menus adjust Sense I nput Gain for a proper gain setting Check Sense for the current sense input level The setting should be between 45 dB and 2
32. nt noise conditions Listen for hums buzzes or inter ference that might be masking true ambient noise Move sense mic if necessary Adjust Sense Input Gain to proper level Also it may be possible that someone accidentally changed downstream level controls after the unit was last calibrated This change causes AmbiSense to produce erroneous results Correct this by recalibrating the unit NOTES e The accuracy of the 371 is only as good as the quality of your microphones e The actual gain sense ratio may differ from the setting chosen during set up and diplayed on the LCD The displayed ratios are guidelines only The AmbiSense algorithm may modify the actual ratios based upon the data it gathers during the calibration process as necessary Unit is at minimum gain all the time Check if microphone is connected or turned on Check signal at sense input Ducker doesn t work Ducker Threshold set too high Ducker Depth set to 0 Check connections to see if input signal is connected and turned on 20 Symetrix 371 SPL Computer User s Guide Troubleshooting continued SYMPTOM PROBABLE CAUSE WHAT TO DO Noise hiss Check input signal levels and level control settings Check gain settings on downstream equipment for presence of noise in input signal Hum or buzz in output Check input connector wiring Check for a ground loop problem Inspect related system equipment grounding to see that all sy
33. p Optional Accessories Notational Conventions in this User Guide Operator Safety Summary Equipment Markings What Ships in the Box M The 371 unit M One PS 3 117 volt PS 3E 230 volt or PS 3 100 volt power supply M This user s guide M A warranty card You can register online at www symetrixaudio com Getting Help If you have questions beyond the scope of this guide contact our Technical Services Group in the following ways tel 425 787 3222 6 00 am to 5 00 pm Monday through Friday Pacific Time fax 425 787 3211 email Email tech symetrixaudio com web www symetrixaudio com Optional Accessories MODEL ITEM DESCRIPTION RM 3 19 in Rack Tray 1 U shelf FP 3 Filler Panel Covers unused half of rack tray when one 371 unit is mounted PY 3 Y Power Cable Connects a 371 with any other 300 Series product RC 3 Remote Control Controls program channel volume Contact your dealer or Symetrix for purchasing information Notational Conventions in this User Guide NOTE CAUTION WARNING CAPS Bold Face Underline Identifies information that needs extra emphasis Generally supplies extra information to help you to better use the 371 Identifies information that if ignored may cause damage to the 371 unit or other equipment in your system Identifies information that if ignored may be hazardous to your health or that of others Controls switches or other markings on the
34. stem components are on the same AC ground Distortion Check input signals for distortion Check if line input signal is too hot Check if the sound system has sufficient power for the SPL that you are trying to attain If using a high setting for Adjust to Maximum in calibration you may be overloading the input to your amplifier select a lower value Ensure that something downstream isn t clipping No audio using remote Check Output Trim to see if Remote is enabled volume controls 371 is inoperative Certain uncontrollable events lightning flood nuclear blast other cata strophic disturbances can corrupt the 371 s memory rendering it inopera ble To return the 371 s memory to its factory default state 1 Disconnect AC power 2 Press and hold in the NEXT and EXIT buttons 3 Re connect AC power 4 Release the NEXT and EXIT buttons 5 Press and release EXIT three times Now the LCD screen will display EEPROM defaults restored followed by the software version number After doing this all previous setup and calibration data will have been lost and must re entered as if it were a brand new installation 6 Give to you favorite charity generously Music page is too loud Try re calibrating making sure that music page is playing continuously during the calibration process at it s normal or normal to high level 21 Symetrix 371 SPL Computer User s Guide Hardware Specifications Input
35. ts most standard dynamic and condenser microphones Built in mic preamp can supply 15 V phantom power and gain that ranges from 0 dB to 70 dB in 10 dB steps Symetrix 371 SPL Computer User s Guide Making Hardware Connections Overview of Rear Panel Connectors Sensing Microphone Considerations 371 Basic Connection Connecting a Remote Volume Control Connecting a Switch for External Ducking Control Input and Output Connector Wiring Sensing Microphone Considerations Type of Microphone For most applications an inexpen sive low impedance omnidirectional microphone such as a lavalier microphone works adequately Some installers have used boundary microphones with good success they re unobtrusive Other installers have mounted microphone cartridges available from Mouser Electronics in the U S inside electrical boxes equipped with a single holed cover In smaller rooms or acoustically live spaces a directional microphone is a good choice because you can use its position to favor the ambient sound and minimize pickup from the sound system loudspeakers If the sense mic is positioned a rela tively long distance from the ambi ent noise source s a directional microphone may improve system performance NOTE No matter what kind of microphone you choose during cali bration the 371 will adapt itself to the characteristics of that mic Location of Microphone The sensing microphone needs
36. y counterclock wise below the setting for 10 to choose Remote The actual gain according to the remote pot setting now displays 3 Press EXIT or NEXT to save setting Keep gain in 10 dB to 10 dB range for accurate opoeration How ever a remote pot can dim the audio down to 50 dB temporarily Cropped Rear Panel View of 371 REMOTE Symetrix EMOT DUCKER CONTROL hh LINE OUTPUT RIGHT LEFT h h LINE INPUT RIGHT LEFT HHH Cropped Rear Panel View of 371 Potentiometer CCW Symetrix REMOTE GAIN DUCKER CONTROL h LINE OUTPUT LINE INPUT _ RIGHT LEFT Symetrix RC 3 Symetrix 371 SPL Computer User s Guide Making Hardware Connections Overview of Rear Panel Connectors Sensing Microphone Considerations 371 Basic Connection Connecting a Remote Volume Control Connecting a Switch for External Ducking Control Input and Output Connector Wiring External Ducking Control The DUCKER CONTROL input is nor mally connected to a line level audio signal from any source you would like to use to trigger a momentary decrease in volume ducking NOTE The signal applied to the DUCKER CONTROL input does not get mixed with the program audio In other words the ducking input signal functions only as a control signal Alternative
37. y gives Buyer certain rights Buyer may have additional rights under applicable law Symetrix 371 SPL Computer User s Guide Service Where to Get Service To Have Your 371 Repaired USA Customers Only If outside of the USA Y 1 Call our Technical Services Group for a return authorization RA number If you have determined that your 371 requires repair services and you 2 425 787 3222 Monday through Friday live outside of the United States 6 00 am to 5 00 pm Pacific Time please contact your local Symetrix dealer or distributor for instructions Have your serial number ready to give to the service representative on how to obtain service 3 Pack the unit in its original packaging materials If inside the USA 4 Include your name address daytime telephone number and a brief Le LE statement of the problem Symetrix will attempt to perform in warranty or out of warranty service 5 Write the RA number on the outside of the box on any product it has manufactured 6 Ship the unit to Symetrix freight prepaid for a period of five years from date of manufacture assuming all original equipment components are still Symetrix Inc available from their respective man 14926 35th Ave West ufacturers If you reside in the USA Lynnwood WA 98037 USA then proceed as follows In Warranty Repairs If You Don t Have Factory Packaging Materials We do not accept freight collect shipments Repairs made in warranty will cost If
38. ymetrix 371 SPL Computer User s Guide Architects and Engineers Specifications The Ambient Level Controller ALC shall control the out put level of the sound system in response to the observed acoustical noise level within the controlled space during system operation These measurements shall be made continuously not just during gaps in the audio program The ALC shall utilize microphones to sense the ambient noise level The unit shall incorporate front panel head phone output enabling the user to monitor the ambient sense signal system The ALC shall provide user adjustable parameters to alter the way that it responds to changes in the ambient noise level These parameters are minimum and maxi mum gain through the device noise sensing protocol gain sense ratio ducker control output trim and aver aging time In addition the ALC shall provide an active signal mode bypass mode and a history mode that col lects and displays ambient noise history from the con trolled space The ALC shall provide two independent line level bal anced inputs and outputs that control two audio signals The maximum input level shall be 20 dBu and the maximum output level shall be 26 dBu 22 dBm into 600 ohms balanced The balanced input impedance shall be 20 000 ohms and the output source impedance shall be 200 ohms balanced 100 ohms unbalanced The gain control range shall be 30 dB to 20 dB The fre quency response shall be 20 Hz to 20
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