303 Interface Amplifier (Bi-directional)
Contents
1. 303 Interface Amplifier Bi directional Users Guide Symetrix Table of Contents Chapter 1 Introduction 1 Chapter 2 Operator Safety Summary 2 Chapter 3 Fast Setup 3 Chapter 4 Front amp Rear Panel Overview 4 Chapter 5 Tutorial 5 Chapter 6 Applications 6 Chapter 7 Troubleshooting 7 Chapter 8 Specifications 8 Chapter 9 Warranty and Service 9 Chapter 10 Declaration of Conformity 11 Rev A 15 June 1998 Symetrix part number 53303 0A00 Subject to change at our whim and fancy without notice 1998 Symetrix Inc All right reserved Symetrix is a registered trademark of Symetrix Inc Mention of third party products is for informational 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 manual may be Symetrix reproduced or transmitted in any form or by any 6408 216th St SW means electronic or mechanical including photo Mountlake Terrace WA 98043 USA copying scanning recording or by any information Tel 425 778 7728 storage and retrieval system without permission in Fax 425 778 7727 writing from Symetrix Inc Email symetrix symetrixaudio com Chapter 1 Computer audio recording systems and high quality consumer audio equipment provide their users with efficient and affordable systems Unfortunately they also create a few audio challenges of t2. UT 2 B SYMETRIX psa Go D OR PS 3E POWER CE QY SUPPLY ONLY or 4dBu IN R 4dBu IN L 6 tl COMPUTER AUDIO CARD OR OTHER BALANCED 10DbV SOURCE PRO LEVEL AUDIO 4dBu DESTINATION Connecting the Output of a 4dBu Device to 10dBV Gear The diagram below shows how the 303 should be connected in line between the balanced outputs of a 4dBu device and the unbalanced inputs of a 10dBV unit such as a DAT machine or cassette recorder XLR PIN 2 HIGH 1 4 TIP XLR PIN 3 LOW 1 4 RING OUTPUT XLR PIN 1 GND 1 4 SLEEVE OUTPUT SIDECHAIN SIDECHAIN UNBALANCED IN OUT IN OUT BALANCED SIGNAL FROM BALANCED PRO AUDIO 4dBu DEVICE MANUFACTURED BY SYMETRIX INC LYNNWOOD WA USA POWER CONNECT TO INPUT SYMETRIX PS 3 D ot OR PS 3E POWER CE OW SUPPLY ONLY THIS PRODUCT CONTAINS NO USER SERVICABLE PARTS FABRIQU AUX E U PAR SYMETRIX INC LYNNWOOD WASHINGTON R F REZ TOUTE R PARATION UN TECHNICIEN QUALIFI O Symetr ix o A TO o 4dBu OUT R 4dBu OUT L SIGNAL TO CONSUMER 10dBV AUDIO DEVICE Chapter 7 Troubleshooting Troubleshooting Chart SYMPTOM PROBABLE CAUSE No output signal Check cables and connections Are inputs driven by outputs and outputs driving inputs Check for AC power presence Is the 303 s power l
3. Z TOUTE R PARATION UN TECHNICIEN QUALIFI MANUFACTURED BY SYMETRIX INC LYNNWOOD WA USA 4dBu OUT R 4dBu OUT L O Symetrix POWER CONNECT TO INPUT SYMETRIX PS 3 ce di UNBALANCED TO BALANCED C9 C9 10dBV IN 4dBu IN R 4dBu IN L soa OUT Rear panel Symetrix etrix Operator Safety Summary The information in this summary is intended for persons who operate the equipment as well as repair personnel Specific warnings and cautions are found throughout this manual wherever they may apply The notational conventions used in this manual and on the equipment itself are described in the following paragraphs Equipment Markings CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN TO REDUCE THE RISK OF FIRE OR WARNING ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE a RISQUE DE CHOC ELECTRIQUE AVIS NE PAS OUVRIR SEE OWNERS MANUAL VOIR CAHIER D INSTRUCTIONS No 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 triangle is intended to alert the user of the presence of uninsulated dangerous voltage within the product s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to per sons The exc
4. Z TOUTE R PARATION A UN TECHNICIEN QUALIFI CONNECT TO UNBALANCED TO BALANCED BALANCED TO UNBALANCED OK SYMETRIX PS 3 OR PS 3E POWER SUPPLY ONLY R L 4dBu OUT R 4dBu OUT L 10dBV IN 4008 OUT 4dBu IN R 4dBu IN Rear Panel POWER INPUT Note UNBALANCED TO BALANCED 4dBu OUT L and 4dBu OUT R 10dBV IN L and R Note BALANCED TO UNBALANCED 10dBV OUT L and R 4dBu IN R and L 7 pin DIN receptacle Connect this to the 7 pin DIN plug of a Symetrix PS 3 or PS 3E only Connect the AC power connector of the PS 3 or PS 3E to an AC power source that is of the correct voltage and frequency as marked on the PS 3 or PS 3E The PS 3 and PS 3E are Symetrix accessories available from your Symetrix dealer This is the input and output section of the 303 s unbalanced 10dBV to 4dBu conversion level matching circuitry These balanced XLR outputs will contain the signal applied to the 10dBV inputs after that signal has been balanced and raised to 4dBu nominal level These unbalanced RCA inputs accept 10dBV nominal unbalanced signals which are converted to 4dBu balanced signals at the 4dBu outputs The L and R inputs and outputs listed above may be used for stereo left and right signals or they may be used as two mono inputs and outputs because the circuitry for the left and right channels is completely separate These are the input and output j
5. acks for the 303 s balanced 4dBu to 10dBV conversion level matching circuitry These unbalanced RCA outputs will contain the signal applied to the 4dBu inputs after that signal has been unbalanced and lowered to 10dBV nominal level These balanced XLR inputs accept 4dBu nominal balanced signals which are converted to 10dBV unbalanced signals at the 10dBV outputs Chapter 5 Tutorial Consumer Audio Equipment For the purposes of this discussion consumer audio equipment is defined as equipment that is designed to operate at 10dBV nominal signal levels The inputs and outputs of this type of gear are unbalanced Typically the input and output connectors are of the RCA type To operate properly and with the lowest noise performance the signal level applied to the line input of a consumer audio device must be 10dBV nominal If the input signal is too low the apparent noise floor will increase as the overall gain is increased downstream to compensate for the weak input signal Ifthe input signal is too weak 1t may never reach the threshold at which the consumer device begins to act If the input signal is too high i e 4dBu headroom will be greatly reduced and the input stage of the audio device may overload and distort Consumer audio equipment is unbalanced and unbalanced wiring is susceptible to RF radio frequency interference as well as other types of induced noise and hum The length of intercon necting cables for unba
6. e width of one rack space The physical dimensions shall be 1 75 Hx8 5 W x 6 5 D 4 445cmHx21 59cm Wx15 875cmD The interface amplifier shall operate by means ofa Symetrix PS 3 or PS 3E power supply connected to 117V AC nominal 95 130V AC 50 60 Hzor230V AC nominal 165 255V AC 50 Hz The interface amplifier shall be a Symetrix Inc model 303 Interface Amplifier Bi directional Specifications Input Output 4dBu to 10dBV Circuit Maximum Input Level 28 dBu Balanced 22dBu Unbalanced Maximum Output Level 18 dBV Unbalanced Input Impedance 40k Ohms Balanced 20k Ohms Unbalanced Output Impedance 100 Ohms Unbalanced Input Common Mode Rejection gt 40dB Performance Data 4dBu to 10dBV Circuit Frequency Response 10 Hzto 30 kHz 0 1dB THD Noise lt 005 at 28dBu Gain 12dB Input Output 10dBV to 4dBu Circuit Maximum Input Level Maximum Output Level 8dBV Unbalanced 22 dBm Balanced 600 Ohm load 18dBm Unbalanced 600 Ohm load 100k Ohms Unbalanced 200 Ohms Balanced 100 Ohms Unbalanced Input Impedance Output Impedance Performance Data 4dBu to 10dBV Circuit Frequency Response 10 Hzto 30 kHz 0 1dB THD Noise lt 005 at 8dBV Gain 12dB Connections Input XLR RCAjacks Output XLR RCAjacks Power In 7 pin DIN Physical Size hwd 1 75 x 8 5 x 6 5 in 4 445 x 21 59 x 15 875 cm Shipping Weight 4 5 lbs Electrical Power Requirements 117V AC nominal 95 130V AC 50 to 60 Hz 230V AC
7. heir own Joining consumer audio gear with professional audio gear in a signal path requires connecting equipment designed to operate at different signal levels A direct wire connection between them should be avoided The Symetrix 303 Interface Amplifiercreates a proper interface between consumer and profes sional audio gear This tool provides bi direc tional level matching and balanced unbalanced conversion between professional 4 dBu nominal level balanced audio equipment and consumer 10 dBV nominal level unbalanced audio components The 303 has two completely separate channels of conversion and level matching in each direction from 10dBV to 4dBu and from 4dButo 10dBV This means that in each direction the 303 may be used as a stereo interface amplifier or as two mono interface amplifiers All inputs and outputs may be used at the same time allowing up to four channels of simultaneous level matching and conversion Level matching permits the connection of consumer and pro audio gear while allowing both types of units to operate at optimal perfor mance levels A typical use of the 303 would be to connect a DAT cassette deck or computer sound card all of which generally run at 10dBV nominal level to a professional audio mixer 4dBu nominal level or vice versa Introduction The Symetrix 303 also provides conversion from unbalanced 10dBV outputs to balanced 4dBu inputs and conversion from balanced 4dB
8. ight on Humorbuzzinoutput Check input and output connector wiring Ground loop check related system equipment grounding Are all system components on the same AC ground Distortion Check input signal Is it too hot or is it already distorted Check the output loading It should be above or equal to 600 ohms Is the input of the device following the 303 clipping Is something else clipping Noise hiss Check input signal The 303 s unbalanced inputs are designed to run at 10dBV nominal and the 303 s balanced inputs are designed to run at 4dBu nominal Make sure that you are feeding a line level not mic level signal to the 303 at the appropriate nominal level Check gain settings on downstream equipment The system gain structure should be such that the 303 operates at or near unity gain Is the input signal already noisy No Power LED Is the 303 plugged in Is the AC outlet OK C9 C9 etrix Specifications Chapter 8 Architects and Engineers Specifications The Symetrix 303 Interface Amplifier Bi directional shall simultaneously provide the following two channels of 10dBV to 4dBu nominal signal level matching and two channels of 4dBu to 10dBV nominal signal level matching All 10dBV input and output connectors shall be unbalanced RCA type phono connectors All 4dBu input and output connectors shall be balanced 3 pin XLR AES IEC standard wiring pin2 The unit shall occupy half of th
9. ithout picking up appreciable noise or hum Beware of using unbalanced cables to interconnect balanced equipment Doing this immediately changes the operation of your balanced equipment to unbalanced and destroys the noise immu nity advantage of your balanced gear Also avoid making a direct wire connection between unbalanced and balanced gear This connec tion changes the operation of your balanced equipment to unbalanced and destroys the noise immunity advantage of your balanced gear Use your Symetrix 303 instead Interconnecting Consumer and Professional Audio Equipment To properly connect a piece of consumer audio equipment to a piece of professional audio gear you must ensure that each type of gear receives the appropriate nominal signal levels You must also make sure that the inputs and outputs of your balanced equipment are connected to balanced cables which are in turn connected to other balanced equipment The Symetrix 303 inserted in the signal path between consumer and professional audio devices accomplishes both of these functions maintaining the integrity of the signal as it passes between the two types of audio equipment Symetrix Applications Chapter 6 Connecting the Output of a Computer Audio Card to 4dBu Gear The diagram below shows how the 303 should be connected in line between the audio card s 10dBV unbalanced output and the input of a 4dBu balanced device POWER CONNECTTO INP
10. lamation point within an equilateral triangle is intended to alert the user of the presence of important operating and mainte nance servicing instructions in the literature accompanying the 303 i e this manual Caution To prevent electric shock do not use the polarized plug supplied with the 303 with any extension cord receptacle or other outlet unless the blades can be fully inserted Terms Several notational conventions are used in this manual Some paragraphs may use Note Caution or Warning as a heading Certain typefaces and capitalization are used to identify certain words These are Identifies information that needs extra emphasis A Note generally supplies extra information to help you to better use the 303 Note Chapter 2 Caution Identifies information that if not heeded may cause damage to the 303 or other equipment in your system Warning Identifies information that if ignored may be hazardous to your health or that of others CAPITALS Controls switches or other markings on the 303 s chassis Boldface Strong emphasis Power source This product is intended to operate from a power source that does not apply more than 255Vrms between the power supply conductors or between either power supply conductor and ground A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation Danger from loss of ground If the protective ground c
11. lanced equipment must be kept to a minimum under 10 feet to minimize the noise and hum that may be induced in the cables Semi pro audio equipment also falls into this category Professional Audio Equipment For the purposes of this discussion professional audio equipment is defined as equipment that is designed to operate at 4dBu nominal signal levels The inputs and outputs of this type of gear are balanced Typically the input and output connectors are of the XLR type To operate properly and with the lowest noise performance the signal level applied to the line input of a professional audio device must be 4dBu nominal If the input signal is too low i e 10dBV the apparent noise floor will increase as the gain is increased downstream to compen sate for the weak input signal If the input signal is too weak it may never reach the threshold at which the professional device begins to act If the input signal is too high the input stage of the audio device may overload and distort Professional audio equipment is balanced and balanced wiring is designed to reject RF radio frequency interference as well as other types of induced noise and hum Balanced inputs utilize Common Mode Rejection to get rid of any noise or hum that may have been picked up by the interconnecting cables The relative immunity of balanced wiring to induced noise and hum permits the interconnecting balanced cables to be very long sometimes hundreds of feet w
12. nominal 165 255V AC 50Hz In the interest of continuous product improvement Symetrix Inc reserves the right to alter change or modify these specifications without prior notice 0 1998 Symetrix Inc All rights reserved Chapter 9 303 Limited Warranty Symetrix Inc expressly warrants that the product will be free from defects in material and workmanship for 18 months Symetrix s obligations under this warranty will be limited to repairing or replacing at Symetrix s option the part or parts of the product which prove defective in material or workmanship within 18 months from date of shipment provided that the Buyer gives Symetrix prompt notice of any defect or failure and satisfactory proof thereof Products may be returned by Buyer only after a Return Authorization number RA has been obtained from Symetrix Buyer will prepay all freight charges to return the product to the Symetrix factory Symetrix reserves the right to inspect any products which may be the subject of any warranty claim before repair or replacement is carried out Symetrix may at its option require proof of the original date of purchase dated copy of original retail dealer s invoice Final determination of warranty coverage lies solely with Symetrix Products repaired under warranty will be returned freight prepaid by Symetrix via United Parcel Service surface to any location within the Continental United States At Buyer s request the shipme
13. nsibility thatthe product 303 Interface Amplifier Bi directional to whichthis declaration relates is in conformity with the following standards EN 60065 Safety requirements for mains operated electronic and related apparatus for household and similar general use EN 50081 1 Electromagnetic compatibility Generic emission standard Part 1 Residential commercial and light industry EN 50082 1 Electromagnetic compatibility Generic immunity standard Part 1 Residential commercial and light industry The technical construction file is maintained at Symetrix Inc 6408 216th St SW Mountlake Terrace WA 98043 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 June 15 1998 Place of issue Mountlake Terrace Washington USA Authorized signatyre Dane Butcher President Symetrix Incorporated 11 CD C9 Symetrix 1303 Symetrix Symetrix Inc 6408 216th St SW Mountlake Terrace WA 98043 USA Tel 425 778 7728 Fax 425 778 7727 Website http www symetrixaudio com Email symetrix symetrixaudio com
14. nt may be returned via airfreight at Buyer s expense Outside the Continental United States products will be returned freight collect The foregoing warranties are in lieu of all other warranties whether oral written express implied or statutory Symetrix Inc Limitation of Liability The total liability of Symetrix on any claim whether in contract tort including negli gence or otherwise arising out of con nected with or resulting from the manufac ture sale delivery resale repair replace ment or use of any product will not exceed the price allocable to the product or any part thereof which gives rise to the claim In no event will Symetrix be liable for any inciden Warranty and Service expressly disclaims any IMPLIED warran ties including fitness for a particular purpose or merchantability Symetrix s warranty obligation and buyer s remedies hereunder are SOLELY and exclusively as stated herein This Symetrix product is designed and manufactured for use in professional and studio audio systems and is not intended for other usage With respect to products purchased by consumers for personal family or household use Symetrix expressly disclaims all implied warranties including but not limited to warranties of merchant ability and fitness for a particular purpose This limited warranty with all terms condi tions and disclaimers set forth herein shall extend to the original purchaser and anyone who p
15. onnection is lost all accessible conductive parts including knobs and controls that may appear to be insulated can render an electric shock In line power supply This product receives its operating power from the Symetrix PS 3 or PS 3E power supply This is the only power supply approved for use with the product Do not connect the product to any other in line or plug in transformer The use of other power sources may cause damage to the equipment or present a shock hazard to the operator Operating location Do not operate this equipment under any of the following condi tions explosive atmospheres in wet locations in inclement weather improper or unknown AC mains voltage or if improperly fused Stay out of the box To avoid personal injury or injury to others do not remove the product covers or panels Do not operate the product without the covers and panels properly installed Chapter 3 Fast Setup Fast First Time Setup Follow these instructions to get your 303 up and running as quickly as possible The intent of this section is fast setup Refer to later chapters for explanation of the 303 s connections and applications 1 Connect the 7 pin connector end of the 303 s external power supply cable to the 7 pin power receptacle on the rear ofthe Symetrix 303 2 Connect the three pronged AC plug end of the 303 s external power supply cable to an AC power source of the proper voltage and frequency as marked on the
16. r and a brief statement of the problem 4 Write the RA number on the outside of the box 5 Ship the unit to Symetrix freight prepaid We do not accept freight collect shipments Repairs made in warranty will cost you only one way freight charges We ll prepay the return surface freight If you send us your product in substandard packaging we will charge you for factory shipping materials If you don t have the factory packaging materials please use an oversized carton wrap the unit in a plastic bag and surround it with bubble wrap Pack the box full of Styrofoam peanuts Be sure there is enough clearance in the carton to protect the rack ears you wouldn t believe how many units are returned with bent ears We will return the unit in Symetrix packaging Of course if the repair is due to operator error parts and labor will be charged In any event if there are charges for the repair costs you will pay for the return freight All charges will be COD unless you have made other arrange ments prepaid Visa or Mastercard Out of warranty Repairs If the warranty period has passed you ll be billed for all necessary parts labor packaging materials and freight charges Please remember you must call for an RA number before sending the unit to Symetrix Chapter 10 Declaration of Conformity Declaration of Conformity We Symetrix Incorporated 6408 216th St SW Mountlake Terrace Washington USA declare under our sole respo
17. rear of the unit Caution Failure to connect the 303 to the proper mains voltage may cause fire and or internal damage Warning Lethal voltages are present inside the chassis There are no user serviceable parts inside the chassis Refer all service to qualified service personnel or to the factory 3 To connect the analog output s of a consumer 10dBV audio device to the analog input s of a professional 4dBu audio device A Connect the output s ofthe 10dBV device to the Symetrix 303 s RCA input jack s B Connect the Symetrix 303 s XLR output jack s to the input s of the 4dBu device 4 To connect the analog output s of a professional 4dBu audio device to the analog input s of a consumer 10dBV audio device A Connect the output s of the 4dBu device to the Symetrix 303 s XLR input jack s B Connect the Symetrix 303 s RCA output jack s to the input s of the 10dBV device Once you have completed the previous steps the 303 should pass signal Fast setup is complete cn O Co O Symetrix Symetrix Front Rear Panel Overview Chapter 4 303 INTERFACE AMP BI DIRECTIONAL Front Panel PWR LED This is the power LED which lights to indicate the presence of power at the 303 s power input jack MANUFACTURED BY SYMETRIX INC LYNNWOOD WA USA IS PRODUCT CONTAINS NO USER SERVICABLE PARTS FABRIQUE AUX E U PAR SYMETRIX INC LYNNWOOD WASHINGTON R F RE
18. u outputs to unbalanced 10dBV inputs This conversion can also be used to minimize noise and hum A note about setup Unbalanced cables are much more susceptible to induced noise and hum than balanced cables when used with balanced inputs and outputs and the longer an unbalanced cable 1s the more noise and hum you are likely to pick up If you keep the unbalanced cables between the consumer equipment and the 303 short under 10 feet and use the balanced lines between the professional gear and the 303 for any long cable runs you are far less likely to pick up noise and hum and you take advantage of the common mode rejection of the balanced input Low noise operation is also ensured by the Symetrix 303 sexternal power supply which eliminates the possibility of power supply noise developing in the 303 s circuitry We recommend that you read this manual cover to cover You will find the answers to most of your questions inside However if you are in a hurry go directly to Chapter 3 Fast Setup It will get you started quickly Please feel free to contact us if you have questions comments or suggestions Phone 425 778 7728 Fax 425 778 7727 Email symetrix symetrixaudio com Website www symetrixaudio com 303 INTERFACE AMP BI DIRECTIONAL o CTE PWR o Front panel THIS PRODUCT CONTAINS NO USER SERVICABLE PARTS FABRIQUE AUX E U PAR SYMETRIX INC LYNNWOOD WASHINGTON R F RE
19. urchases the product within the specified warranty period Symetrix does not authorize any third party including any dealer or sales representative to assume any liability or make any addi tional warranties or representation regarding this product information on behalf of Symetrix This limited warranty gives the buyer certain rights You may have additional rights provided by applicable law tal or consequential damages including but not limited to damage for loss of revenue cost of capital claims of customers for service interruptions or failure to supply and costs and expenses incurred in connection with labor overhead transportation installa tion or removal of products or substitute facilities or supply houses C9 C9 Symetrix Servicing the 303 If you have determined that your 303 requires repair services and you live outside of the United States please contact your local Symetrix dealer or distributor for instructions on how to obtain service If you reside in the U S then proceed as follows Before sending anything to Symetrix contact our Customer Service Department for a return authorization RA number The telephone number is 425 778 7728 or email tech symetrixaudio com In warranty Repairs To get your 303 repaired under the terms of the warranty 1 Call us for an RA number 2 Pack the unit in its original packaging materials 3 Include your name address daytime telephone numbe
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