True Manufacturing Company PRECISION 8i User's Manual
Contents
1. e EN55103 2 1997 Technical files are maintained at corporate headquarters of Sunrise Engineering and Design Inc 1634 S Research Loop Suite 110 Tucson Arizona 85710 USA Owner s Record We recommend that you record the following information for reference in the event that you need to contact TRUE Systems for technical support or repairs Please return your completed Warranty Card today Serial No Purchase Date Dealer Address ee eee Phone PRECISION 8i OPERATION MANUAL CONTENTS SAFETY and OPERATING PRECAUTIONS 2 CERTIFICATIONS 3 Owner s Record 3 Table of Contents 4 INTRODUCTION 5 PRODUCT OVERVIEW 5 UP AND RUNNING IN A HURRY 6 INSTALLATION 7 Unpacking and Inspection 7 Mounting 8 Ventilation 8 OPERATION 8 Connections 8 AC Mains Connection 8 Output Cable Connection 10 Microphone Cable Connection 11 A Word About Cables 11 Front Panel Controls 12 More About M S Decoding 14 DESIGN APPROACH 16 SPECIFICATIONS 16 TROUBLESHOOTING 17 REGISTRATION and WARRANTY 18 SERVICE and SUPPORT INFORMATION 19 PRECISION 8i OPERATION MANUAL INTRODUCTION The PRECISION 8i is designed to provide the detailed transparent sonic performance necessary for the most critical direct tracking and live sound applications It includes a unique combination of functions that make it useful as a complete input system for standalone or PC based recording systems And the PRECISION 8i has special features that provide the serious2. symbol below the MIC 1 and MIC 2 connectors This is simply a visual reminder when using an M S mic setup to connect the MID mic to channel 1 and the SIDE mic to channel 2 See the section More About M S Decoding for more information A Word About Cables Most users of the PRECISION 8i have invested much time and money in their selection of microphones and preamplifiers We recommend that you give some consideration to the microphone instrument and output cables you select as well 11 PRECISION 8i OPERATION MANUAL Use high quality low capacitance cable Braided shielding and star quad type mic cables will perform better in electrically noisy environments Manufacturers such as Canare Mogami and others make high performance cable of this type Some house brand cables are made by quality manufacturers but others can be inferior Be careful Use cables with high quality connectors Neutrik Switchcraft etc Our studio testing has shown that some of the more esoteric guitar instrument super cables do indeed sound better Noticeable improvement but at a stiff price Try before you buy Avoid excessive cable length Replace damaged connectors Front Panel Controls W 3 a 8 OL PK OL PI Gd 5 a 3 Mgt 3 _L W 2 O ve 6 EUIS lh ES AA TRUE Peas aw Ol WO systems PA px 5 AA 1 amp Q ae gd
3. PRECISION 8i OPERATION MANUAL ee nD nD Microphone Connection Microphone connection is made to standard XLR receptacles on the rear panel The wiring configuration used for the microphone connectors on the PRECISION 8i is e Pin 2 is positive e Pin 3 is negative e Pin 1 is shield Do not attempt to connect unbalanced microphones with single pin connectors to the PRECISION 8i It is not intended to operate with this type of microphone CAUTION We recommend that you avoid hot patching microphone inputs when using a patch bay at the microphone inputs of the PRECISION 8i Please TURN OFF phantom power and turn down the gain prior to connecting or re patching microphone inputs routed through a patch bay Failure to do so may result in transients that can damage the PRECISION 8i or equipment that is connected to its outputs not to mention your ears Electric Instrument Connection Dual purpose input connectors 5 are available on channels 7 and 8 Insert XLR microphone connector for normal MIC 7 and MIC 8 operation Insert 1 4 phone plug for use as Direct Input for instruments DI 1 and DI 2 DI 1 and DI 2 are controlled by Gain and 6 phase controls for channels 7 and 8 respectively The gain range for the direct inputs is from 4 dB to 44 dB NOTE DO NOT use TRS plugs for these inputs as the DI will not function correctly M S mid side Microphone Connection You may_note the M S mid side connection
4. SN 4 A Ye E sic x Na ye PA A P X atu N oe p 7 7 x 2 P pa 4 r N F ai 1 6 PAN ZIN Z7 C 5 Phase reverse selector Output signal polarity is reversed when the button is depressed Phantom power selector Phantom power 48V is activated when the 48V button is depressed Avoid selecting phantom power if you are using a ribbon microphone While not required it is advisable to de select 48V when using a dynamic microphone or a DI input Overload warning indicator OL illuminates and holds at 26 dBu which is 5 dB below actual overload Depress RESET 410 to clear OL Peak Hold indicators These are provided to help optimize level setting when the PRECISION 8i is remotely located from the device to which it is connected The PK indicator activates and holds at the level selected on the PEAK REFERENCE selector 9 The 3 indicator activates at peak level minus 3 dB The 6 indicator 12 PRECISION 8i OPERATION MANUAL O activates at peak level minus 6 dB Generally the PEAK REFERENCE selector is set for the maximum level you want to present to your mixing console recorder etc Depress RESET to clear PK NOTE Only the OL light indicates impending preamp overload The red PK light simply indicates that the signal has exceeded the level selected on the PEAK REFERENCE switch Note that the overload level of the PRECISION 8i is 31dBu at the output This level exceeds the
5. input capability of some devices check manufacturers specifications In other words it may be possible to cause overload distortion in the connected device even though the PRECISION 8 i level indicator does not show a red light We can provide accessory Output Attenuators in applications where this is necessary Please consult the factory for assistance Signal Present indicator The SIG indicator activates at approximately 24 dBu Operating level indicator The 4 indicator activates when the output level reaches 4 dBu normal operating level When the PEAK REFERENCE selector is set to the 10 dBV position the operating level indicator activates at 10 dBV output level Mid Side mode selector When the ON button is depressed Channel 1 output becomes Left and Channel 2 output becomes Right The Channel 1 gain control adjusts the mono signal level applied to both the Left and Right outputs The Channel 2 gain control adjusts the stereo image width Gain control This control adjusts the preamp gain over the range of 16 dB to 64 dB 6 PRECISION Ole 13 PRECISION 8i OPERATION MANUAL 9 PEAK REFERENCE selector This sets the level at which the Peak Hold indicators activate It also changes the operating level indication to 10 dBV operation when the 10 dBV position is selected Peak Hold reset RESET clears the peak hold indicators on all ch
6. musician or recordist with useful tools to get the best sound more quickly and easily We appreciate the confidence you have placed in TRUE Systems by purchasing this product Please feel free to contact us with questions or comments And we always appreciate hearing about successful projects you have completed OVERVIEW In addition to our acclaimed TRUE preamps PRECISION 8i features two instrument direct inputs DI s that offer sonic performance previously thought to be available only with dedicated high end DI s You ll get incredible articulation and control for electric bass detail and smoothness for stringed instruments and keyboards The 5 segment peak hold level metering with selectable peak reference allows rapid optimization of program levels between the PRECISION 8i and devices to which it is interfaced Dual output connections provide easy interconnection as well as the ability to act as a mic splitter PRECISION 8i is ideal for location recording due to its compact 1U rack size 8 channel format useful level metering and easy interconnect The integral M S decoder provides creative spatial image control and can be particularly useful in attaining an exciting stereo image with minimum effort and microphone re positioning The M S microphone technique can be employed effectively in a wide variety of circumstances from classical ensemble to drum kit overheads to solo vocal or instrument whenever accurate capture of the
7. systems or authorized TRUE systems repair facility must be prepaid insured and properly packaged Purchaser must obtain a Return Authorization RA number from SUNRISE prior to returning a product Sunrise Engineering and Design Inc Tel 1 520 721 2735 1634 S Research Loop Suite 110 Fax 1 520 722 4057 Tucson Arizona 85710 USA Email info true systems com 19
8. which TRUE preamps have become known SPECIFICATIONS Gain preamp DI Frequency Response gain 40dB Maximum Output Level Maximum Input Level Noise Rs 0 Ohms Slew Rate CMRR CMV 10 dBu THD preamp 26dBu 100kOhm Input Impedance preamp DI Power Consumption Preamp Enclosure Dimensions Preamp Front Panel Extension Power Supply Unit Dimensions Power Supply Unit Height Power Supply Unit Rear Extension Preamp Weight Power Supply Unit Weight 15 5 to 64dB 4 to 44dB 1 5 Hz to 500kHz 3dB 31 dBu 15 dBu 132 dB e i n gt 40 V uS 85 dB 0008 5 5 kOhm 2 5 Mohm 44W 17 5 in 44 5 cm W 13 75 in 35 cm D 1 75 in 4 5cm H 1 in 2 5cm 6 63 in 16 8 cm W 6 4 in 16 3 cm D 1 75 in 4 5cm H 3 in 7 6 cm 10 2 Ibs 4 6 Kg 5 0 lbs 2 3Kg Typical performance Specifications subject to change without notice 16 PRECISION 8i OPERATION MANUAL TROUBLESHOOTING Symptom Solution No signal output Main power switch is on but no LED s are illuminated No signal output Main power switch is on and green power LED is illuminated Output signal is distorted Outputs are connected for balanced operation Output signal is distorted Outputs are connected for unbalanced operation Hum can be heard in the audio program Check AC power source and cord Check fuses pull fuse drawer next to power cord inlet Check status of phantom po
9. L About the Level and Peak Hold Indicators 1 SIG indicates that a signal is present on the channel It illuminates when the signal level exceeds 24dBu 2 4 illuminates when the output signal reaches normal operating level of 4 dBu 3 OL illuminates when the signal level exceeds 26 dBu which is 5 dB below the overload point for the Precision 8i 4 The PEAK HOLD indicators PK 3 6 activate when the output signal level exceeds the level set on the PEAK REFERENCE switch 5 For example With PEAK REFERENCE set to 26 the PK indicator illuminates and stays on at 26dBu the 3 indicator illuminates at 23 dBu and the 6 indicator illuminates at 20 dBu 6 NOTE Only the OL light indicates impending preamp overload The red PK light simply indicates that the signal has exceeded the level selected on the PEAK REFERENCE switch 7 Push the RESET button to reset the PEAK HOLD indicators for all channels It is normal for power on transients and phantom power transients to activate the PEAK HOLD indicators Simply depress RESET to clear the indicators INSTALLATION Unpacking and Inspection We recommend that you inspect your PRECISION 8i upon unpacking it from the factory shipping carton In the unlikely event that the unit exhibits any physical damage DO NOT connect it to the AC mains power but contact your dealer immediately In addition to the PRECISION 8i the shipping carton should also include e An International
10. Power Supply Module PSU P8i An AC power cord A warranty registration card A Caution sheet This Operation Manual We recommend that you keep the shipping carton and foam supports in the event that the unit must be shipped at some time in the future DO NOT package the unit in packing peanuts or similar material as it will settle during shipping and damage will likely occur If original packing materials cannot be located wrap the unit with a liberal amount of plastic bubble wrap material extending at least 2 beyond the extremities of the PRECISION 8i enclosure PRECISION 8i OPERATION MANUAL Mounting The PRECISION 8i is designed for conventional rack mounting or stand alone mounting by use of the adhesive rubber feet supplied Avoid locating the unit next to equipment that emits strong electromagnetic fields If the unit is to be permanently mounted in a high vibration environment you may wish to provide additional side or rear support to prevent possible distortion of the mounting ears e Do not locate the unit where it is exposed to rain moisture or liquid spills e Do not locate the unit where it is exposed to temperature extremes e Do not mount the Power Supply Unit closer than one rack space from the preamp unit This avoids coupling unwanted magnetic interference into the preamp unit Ventilation We recommend that you provide adequate ventilation so that the air temperature surrounding the unit does not
11. TRUE MM sustems istswsOOO S S PRECISION 8i 8 CHANNEL PRECISION MICROPHONE PREAMPLIFIER with M S decoding and Direct Inputs OPERATION MANUAL Version 1 2 SAFETY and OPERATING PRECAUTIONS Important Information A This symbol indicates the presence of dangerous voltage within the product enclosure that presents the risk of electric shock injury When this symbol appears next to an operation discussed in this manual only qualified technical personnel should perform that operation This symbol indicates important operating or maintenance instructions that A N should be read carefully Failure to observe these instructions could result in damage to the product or other property A N WARNINGS To reduce the risk of electric shock injury do not remove the top cover or rear panel Uninsulated dangerous voltage exists within the product s enclosure Refer servicing to qualified personnel Do not defeat the earth ground connection in the AC power cable Tips for eliminating ground loops are discussed in the TROUBLESHOOTING section of this manual Do not operate this unit in the presence of rain liquids or condensing moisture Liquid entering the product enclosure presents the risk of electric shock injury Do not touch the AC plug or enclosure with wet hands Do not defeat intended AC power connection polarization Do not use a damaged or excessively worn cord to connect this unit to AC power CAUTIONS Sev
12. al ground to earth ground Signal ground is isolated from earth ground if the LINK jumper is removed This jumper will normally be installed See Troubleshooting section for usage tips Output Cable Connection For ease of connection we ve provided two styles of balanced output connector 8 channel DB25 and individual TRS 4 Both output types are electrically equivalent and may be used simultaneously to connect to Line Inputs on mixing consoles recorders etc If both pairs of outputs are used care should be taken to avoid system ground loops See Troubleshooting section for tips on avoiding hum caused by grounding problems The DB25 and TRS output connectors are not electronically isolated Therefore if you chose to connect either one of the output connectors to an unbalanced input the other connector will automatically be unbalanced When connecting an output of the PRECISION 8i to an unbalanced input you must connect the negative signal pin pin 3 of the XLR or ring of the TRS to the shield Failure to do this will result in audible distortion The wiring configuration used for the output connectors on the PRECISION 8i is For TRS For DB25 e Tip is positive This output connector is wired e Ring is negative according to the Tascam 8 channel e Sleeve is shield analog wiring configuration DO NOT USE TDIF CABLES 10
13. annels NOTE It is normal for the Peak Hold indicators to activate when phantom power is applied when AC power is applied or when a new setting is made on the PEAK REFERENCE selector simply depress RESET to clear the indicators D Direct inputs DI 1 and DI 2 are controlled by gain controls for channels 7 and 8 respectively The gain range for the direct inputs is from 4 dB to 44 dB AC power indicator The green power LED indicates that the unit is on More About M S Decoding M S Mid Side decoding is a particularly creative feature of the PRECISION 8i While the M S microphone technique has been around for many years the opportunity to use it is frequently limited by the need for specialty microphones and or decoders What is M S MID It is a stereo microphone placement technique that uses a center forward facing omni or cardioid mic Mid and a side facing figure 8 mic Side The signals from these two mics are passed through matrix circuitry that combines them in particular phase and level SIDE relationships to produce a stereo L and R output What good is M S versus the typical XY microphone placement Originally M S was used because it provided a stereo signal with good mono compatibility While this is not very interesting for contemporary stereo CD s it is still valuable for broadcast and film sound production But there is another significant benefit varying the gain of the Side mic in relation to th
14. become available SUNRISE ENGINEERING and DESIGN INC SUNRISE warrants the TRUE systems PRECISION 8i to be free from defects in material and manufacture when properly installed and used according to instructions in the Operation Manual for a period of one year from the date of sale to the original purchaser Units returned for warranty repair to SUNRISE or an authorized TRUE Systems repair facility will be 18 PRECISION 8i OPERATION MANUAL repaired or replaced at the manufacturer s option free of charge Supplementary shipping charges will apply to units returned to addresses outside the continental USA All units returned to SUNRISE or authorized TRUE systems repair facility must be prepaid insured _and_ properly packaged Purchaser must obtain a Return Authorization RA number from SUNRISE prior to returning a product SUNRISE may require proof of the purchase date in the form of a copy of a dated original retail invoice This warranty is void if in the sole judgment of SUNRISE the product has been abused neglected misapplied or has been damaged by an accident modification or attempted repair by unauthorized personnel This warranty will not apply to cosmetic damage incurred due to normal handling and use SUNRISE reserves the right to change or improve the product design at any time without prior notice Incorporation of design changes in future versions of the product does not imply the availability of upgrades for exi
15. cated from the device s to which it is connected Jumpers inside the unit select this optional mode If you wish to configure the unit for this mode proceed as follows the enclosure of this product This operation should only be performed b ualified personnel NEVER open the product enclosure while the AC power cord is attached WARNING ELECTRIC SHOCK HAZARD Dangerous voltage exists inside e Disconnect AC power cord e Remove the twelve screws securing the top cover to the enclosure Remove the cover Locate the eight upright printed circuit boards along the front panel e Select level indicator mode by setting jumpers J2 as shown below J2 J2 Normal Mode Optional Mode OL PK remain on OL PK 3 6 remain on e Replace cover and secure with twelve screws Make sure no tools loose hardware debris etc remain in the unit prior to attaching the cover 15 PRECISION 8i OPERATION MANUAL DESIGN APPROACH PRECISION 8i features a high voltage composite architecture with discrete devices plus integrated circuits The totally balanced dual servo dc coupled design provides exceptional transient response headroom imaging and noise performance Critical devices have been selected on the basis of extensive listening tests as well as engineering tests Military grade hand matched components are utilized in critical circuit areas These design features result in the transparent detailed sound quality for
16. e Mid mic causes a variation in the stereo image from none to extreme separation It is not necessary to change the angle or position of the microphones in order to change the stereo image This feature can really speed up the time consuming process of finding a sweet spot that provides both good tonal quality and good imaging What are the best applications for M S M S does an excellent job of capturing the natural sonic perspective of acoustical ensembles e Orchestral and choral recording use an M S pair for the central array 14 PRECISION 8i OPERATION MANUAL e Drum kits use an M S pair for drum overhead micing e Vocal and instrumental ensembles use M S to give realistic perspective to backup vocals or instrumental groups e Individual instruments or vocals try M S on acoustic guitar and in situations where you wish to capture room ambience e Broadcast film sound use M S to capture audience noise or background ambience M S can also be used in TV and film work to match the sonic image width to the visual image width Optional Level Indicator Modes The Peak Hold level indicators can operate in two modes As supplied only the OL and PK indicators will hold after they are activated until RESET is depressed An optional mode is available which causes the 3 and 6 indicators to also hold until RESET is depressed This mode can be helpful in live sound and recording applications where the PRECISION 8i is remotely lo
17. ere damage may be caused to your unit if the AC voltage setting is not correct for the AC power available in your area The voltage setting is visible on the AC inlet module on the International Power Supply Module PSU P8i See section on AC Mains Connection for instructions on selecting the proper AC voltage setting If you are unsure about this contact your dealer or TRUE Systems Product failure caused by improper voltage setting will not be covered under warranty Do not operate this unit in the presence of rain liquids or condensing moisture Liquid entering the product enclosure is likely to cause performance degradation or failure Failures due to moisture entering the enclosure will not be covered under warranty Should liquid spill on the unit immediately disconnect it from the AC power source and return it to your dealer or TRUE Systems for servicing This product is designed to operate in an ambient temperature environment not to exceed 50 C 122 F Please ensure that this unit is mounted in such a way that vents are not blocked and ambient temperature does not exceed 50 C CERTIFICATIONS Declaration of Conformity CE Sunrise Engineering and Design Inc hereby declares the TRUE Systems PRECISION 8i 8 channel microphone preamplifier to be in material conformity with the following directives and related standards e 73 23 EEC Low Voltage Directive e 89 336 EEC EMC Directive e EN60065 1998 e EN55103 1 1997
18. exceed 55 C 122 F If multiple units are to be mounted in a poorly ventilated rack or travel case a 1 3 4 blank space should be located after every two units two units mounted together blank space two more units etc OPERATION Connections PSU P8i Ol 40 p AC Mains Connection Prior to connecting the AC mains power cord to the Power Supply Unit verify that the Voltage Selector is set for the AC mains voltage in your area The currently selected voltage appears in the window on the Fuse Drawer O It is important that the voltage is set correctly for both safety reasons and to insure that the PRECISION 8i will operate according to specifications Note also that the correct fuse type must be used See Table below Product damage caused by incorrect voltage settings or fuse selections cannot be covered under warranty PRECISION 8i OPERATION MANUAL To change the AC operating voltage selection This procedure should be performed only by qualified technical personnel If you are not qualified please consult TRUE Systems or your dealer for assistance rc r SK 1 Using an appropriate AC voltmeter measure the AC line voltage at the installation site 2 Make sure the AC power cord is disconnected from the PSU P8i Power Supply U
19. just Gain controls for adequate signal level as indicated on the PRECISION 8i level indicators or on the level indicators of the device to which it is connected If you re using the DI s for electric instrument input 1 Connect your instrument cables to Direct In 1 and Direct In 2 on the rear panel The Direct In jacks are located within the same connectors as MIC 7 and MIC 8 Simply plug your 1 4 phone plug into the center portion of the desired connector NOTE DO NOT use TRS plugs for these inputs as the DI will not function correctly 2 Set buttons as appropriate 3 Adjust DI 1 or DI 2 Gain controls for adequate signal level as indicated on the PRECISION 8i level indicators or on the level indicators of the device to which it is connected If you re using the M S Decoder 1 Connect the cardioid or omni MID mic to MIC 1 input 2 Connect the figure 8 SIDE mic to MIC 2 input Face the SIDE mic toward the right side of the sound field perpendicular to the axis of the MID mic See Figure 1 3 Depress the MID SIDE ON button Left signal is routed to Channel 1 output Right signal is routed to Channel 2 output 4 Adjust the Channel 1 gain control for adequate mono signal level 5 Adjust the Channel 2 gain control to vary the image width as desired 6 See the section More About M S Decoding for more information MID Figure 1 M S microphone orientation gt SIDE PRECISION 8i OPERATION MANUA
20. nit 3 Using a small screwdriver or similar tool release the latch on the Fuse Drawer and pull it and the fuses out of the AC inlet module Using a small screwdriver or similar tool remove the Voltage Selector 2 5 Rotate the Voltage Selector to the appropriate position for the AC voltage measured in Step 1 above See Table below for proper Voltage Selector setting Select the setting that places your measured voltage nearest the middle of the Operating Voltage Range Voltage Selector Operating Voltage Range Fuses 2 100V 90 110VAC 50 60Hz T 500mA L 250V 120V 110 132VAC 50 60Hz T 500mA L 250V 220V 201 240VAC 50 60Hz T 315mA L 250V 240V 220 264VAC 50 60Hz T 315mA L 250V For other operating voltage options consult TRUE Systems CAUTION To provide continued protection against fire replacement fuses should be only of the types listed above Note that two 2 fuses are necessary and that both fuses PRECISION 8i OPERATION MANUAL must be of the same type AC mains power cord must be removed to gain access to Fuse Drawer 1 for fuse replacement a Sx TRUE Systems Precision 8i r Sunrise EngineeNng and Design Inc J Tucson Arixona NAA 5 gt a 3AL7 1 E R OC See eleele e e i gt DO NOT DISCONNECT WITH AC POWER ON AA BAR ae OUT CONNECT Signal Ground Connection LINK 3 connects sign
21. performance and its acoustical space is desired M S micing also eliminates the hole in the middle effect In addition to the previously mentioned features the PRECISION 8i includes e Both 8 channel DB25 and individual TRS output connections for easy connectivity e Individual Polarity Reverse to correct polarity inversions caused by mic position or cable wiring variations e Individual Phantom Power 48V available on the front panel PRECISION 8i OPERATION MANUAL UP AND RUNNING IN A HURRY 1 Read the Safety and Operating Precautions on page 2 of this manual 2 Check the voltage selector on the International Power Supply Module PSU P8i to make sure it is set for the appropriate AC mains voltage in your area 3 After making sure the main power switch is off connect the AC power cord 4 Connect output signal cables between PRECISION 8i and the analog line level inputs of your recorder mixer signal processor etc Use either the individual 1 4 TRS or DB25 eight channel balanced output connectors See the section Connections for wiring details 5 Connect mic cables to MIC 1 through MIC 8 as needed 6 Connect the interface cable on the International Power Supply Module PSU P8i to the main PRECISION 8i unit 7 Turn on the AC power 8 Set PEAK REFERENCE selector to 26 9 Set 48V and 6 buttons as appropriate on each channel 10 Depress the RESET button to clear Peak Hold indicators 11 Ad
22. signal is distorted Radio Frequency Interference can be heard in the audio program swishing sound or audio from a radio transmitter REGISTRATION and WARRANTY Check status of M S selector It should be out for individual channel mode and in for Mid Side mode Check status of M S selector It should be out for individual channel mode and in for Mid Side mode Make sure the selectors for both Channels 1 and 2 are out Make sure the front of the bi directional Side mic is aimed 90 degrees to the right of the axis of the Mid mic Make sure the selectors for both Channels 1 and 2 are in the same position Check continuity of electric instrument cables Check the batteries or AC power source of any foot pedal effects processors connected to the Direct Input Make sure that the instrument cables have standard tip sleeve 1 4 phone plugs DO NOT use TRS plugs Make sure that mic cables are of good quality and that the shield is properly connected Avoid excessive length Make sure that earth ground connection is maintained via the AC power cord DO NOT use an isolator Make sure the unit is located away from known sources of radio frequency energy Don t forget to register your PRECISION 8i by filling out the enclosed Registration Card and returning it to us This allows TRUE Systems to contact you regarding any updates upgrades or applications information that may
23. sting units This warranty is in lieu of all other warranties expressed or implied and SUNRISE specifically disclaims all implied warranties including but not limited to warranties of merchantability and fitness for a particular purpose The purchaser acknowledges and agrees that in no event shall SUNRISE be held liable for any special indirect incidental or consequential damage or for injury loss or damage sustained by any person or property that may result from the use of or failure of this product to operate correctly at any time In the USA some states do not allow the exclusion or limitation of implied warranties or liability for incidental or consequential damage so the previous exclusion may not apply to you This warranty gives you specific legal rights and you may have other rights which vary from state to state SERVICE INFORMATION Other than cleaning the exterior surfaces of your PRECISION 8i and occasional inspection of the AC power cord and audio cables for damage no maintenance procedures should be attempted by the user Cleaning can be performed using a lint free cloth dampened with Windex There are no user serviceable components inside the product enclosure Many of the electronic components are selected and matched at the factory For this reason as well as personal safety considerations we recommend that you refer service requirements to TRUE Systems or authorized repair facilities All units returned to TRUE
24. wer Check continuity of mic and electric instrument cables Check continuity of output cables Make sure gain is adjusted so that the OL indicator does not activate during the audio program Make sure the high output capability of this unit is not overloading the device or monitoring system to which it is connected Set PEAK REFERENCE selector to match capability of device or monitoring system then adjust gain according to indications on the Peak Hold LEDs Check continuity of output cable Make sure outputs are not connected to a load impedance of less than 600 ohms Make sure the minus output signal pins are connected to the shield and not left unconnected See Output Cable Connection section Check troubleshooting tips for balanced operation above Disconnect grounding LINK Check continuity of output cables particularly shields Disconnect shields on one end of output cables Connect grounding LINK If both outputs TRS DB25 are in use try disconnecting shields on DB25 only or TRS only 17 PRECISION 8i OPERATION MANUAL Channel 1 signal can be heard in Channel 2 output and vice versa Channel 2 seems to have no output when used with Channel 1 as a stereo pair In M S mode the stereo channels are reversed Channel 1 is Right and Channel 2 is Left In M S mode the stereo channel phasing is incorrect Electric instrument connected to a Direct Input does not produce a signal or
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