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1. Output Le C9 Output O Symetrix Signal Flow Chart Input CLIP Input LED 10 Display 0 10 Level 0000 PAVAVAVA V lt 1 Output A Level Output B Level Output C Level Output D Level h 268 h 268 h 268 h 268 5 Chapter 7 OUT Chapter 8 Troubleshooting Troubleshooting Chart SYMPTOM PROBABLE CAUSE No output signal Check cables and connections Is the input driven by an output and output driving input Verify cables source and load by patching input and output connections together at the unit Check for AC power presence Humorbuzzinoutput Check input and output connector wiring refer to page 9 Ground loop check related system equipment grounding Are all system components on the same AC ground Distortion Check the level of the input signal on the 305 s LED display Is the CLIP light on all the time If so reduce the incoming signal level by turning the INPUT level counterclockwise Is the incoming signal already distorted Listen up stream from the 305 to make sure you re feeding it a clean signal Noise hiss Check
2. continuous product improvement Symetrix Inc reserves the right to alter change or modify these specifications without prior notice 1998 Symetrix Inc All rights reserved Chapter 10 305 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 shipment may be returned via airfreight at Buyer s e
3. open If you must ground pin 3 it must be grounded at the 305 rather than at the other end of the cable The price regardless of whether or not pin 3 is grounded is 6 dB less output level If your system is wired with pin 3 hot and you are driving an unbalanced load pin 2 must float Balanced Terminal Strip When Using CIRCUIT Ground Wire Shield Not Connected y le A Balanced Female XLR When Using CIRCUIT Ground Pin 1 Not Connected Pin 2 High Pin 3 Low Shield Tab Not Connected Two Conductor Ce Shielded Cable TRS Plug When Using CIRCUIT Ground Tip High Ring Low Sleeve Not Connected Wire Shield Not Connected Two Conductor Shielded Cable Channel Input Channel Input Two Conductor Shielded Cable TS Plug When Using CIRCUIT Ground Tip High Sleeve Low Wire Shield Not Connected ial Two Conductor Shielded Cable SLEEVE RCA Plug When Using CIRCUIT Ground Tip High Sleeve Low Wire Shield Not Connected Channel Input Channel Input Two Conductor Shielded Cable Balanced Male XLR When Using CIRCUIT Ground Pin 1 Circuit Ground Pin 2 High Pin 3 Low Shield Tab Not Connected e Two Conductor Cs is Shielded Cable TS Plug When Using CIRCUIT Ground Tip High Sleeve Shield Wire Low Not Connected Two Conductor ae Shielded Cable Channel
4. such as a CD player for example turn the INPUT level control clockwise to boost the signal Conversely if you re feeding a 8 broadcast level signal to the 305 then turn the INPUT level control counter clockwise until the proper LED display is achieved Output Level Controls The four output level controls on the 305 are in the section marked OUTPUT and are labeled A B C and D Use these controls to attenuate the output level over a 20dB range Start by turning all controls fully clockwise unity gain This will create equal levels from all outputs If for some reason you wish to reduce the level of certain outputs then turn the appropriate control s counterclockwise Otherwise for better overall system performance it s best to leave the controls wide open full clockwise for the hottest possible output signals Chapter 5 Rear Panel Overview Symetrix LL mpu D c B A CONNECT TO t t t SYMETRIX PS 3 h ch E h E h f OR PS 3E POWER SUPPLY ONLY OEO0EOOE OOS se OE E FABRIQU AUX EU PAR SYMETRIX INC LYNNWOOD WASHINGTON REFEREZ TOUTE R PARATION A UN TECHNICIEN QUALIFI Rear panel drawing The 305 is fitted with removable terminal blocks for both input and output connections While not absolutely necessary it is usually much easier to unplug the removable block before making
5. the actual source impedance Symetrix equipment outputs are designed to drive 600 ohm or higher loads 600 ohm loads are an archaic practice that won t go away You don t need to terminate the output with a 600 ohm resistor if you aren t driving a 600 ohm load If you don t understand the concept of termination you probably don t need to mm O Symetrix O Symetrix The two facts that you need to derive from this discussion are o Match signal levels for best headroom and signal to noise ratio m For audio impedance matching is only needed for vintage equipment and power amplifier outputs In all other cases ensure that your inputs bridge your outputs meaning the inputs are in the range of 2 to 200 times the output source impedance Signal Levels The 305 is designed around studio professional line levels 4 dBu or 1 23 volts RMS The unit is quiet enough to operate at lower signal levels such as those found in semi pro or musical instru ment MI equipment 10 dBv or 300 millivolts 1 0 Impedances The 305 is designed to interface into almost any recording studio or sound reinforcement applica tion This includes o 600 ohm systems where input and output impedances are matched m Modern bridging systems where inputs bridge and outputs are low source impedances voltage transmission systems The 305 s input impedance is 20 kilohms balanced The inputs may be driven from any balanced source capable of deliverin
6. 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 305 up and running as quickly as possible The intent of this section is fast setup Refer to later chapters for explanation of the 305 s controls and functions 1 Connect audio inputs and outputs If you do not know how to do this forget Fast Set Up and read Chapter 5 2 Set INPUT level trim control straight up 12 0 clock position 3 Set OUTPUT level trim controls at maximum level clockwise rotation 4 Plug the 305 into an AC outlet using the external power supply Caution Failure to connect the 305 to the proper AC 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 5 Apply line level audio signal to the input Line level means previously amp
7. 0 Hz and 20 kHz THD Noise shall be less than 0 009 measured at 26dBu with a band Specifications Input Output Maximum Input Level Maximum Output Level 26 dBu Balanced 26 dBu Balanced 20k Ohm load 22 dBu 600 Ohm load 20k Ohms Balanced 10k Ohms Unbalanced 200 Ohms Balanced 100 Ohms Unbalanced Input Impedance Output Impedance Performance Data Frequency Response THD Noise 1 2 dB 20 Hz to 20 kHz lt 009 at 26dBu 30kHz measurement bandwidth gt 100dB A weighted ref to 4dBu gt 125 dB A weighted gt 40 dB 20 Hz to 20 kHz Signal to Noise Ratio Dynamic Range Common Mode Rejection Input Gain Range 15dB Output Gain Range 0 to 20dB 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 nominal 165 255V AC 50Hz width of 30 kHz Residual noise will be gt 100 dB below a 4 dBu input signal when measured with an A weighting filter The unit shall occupy half of the width of one rack space The physical dimensions shall be 1 75 Hx8 5 W x6 5 D 4 445cm Hx 21 59em Wx15 875cmD The distribution amplifier shall operate by means of a 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 distribution amplifier shall be a Symetrix Inc model 305 Distribution Amplifier 1x4 In the interest of
8. 305 Distribution Amplifier 1x4 Users Guide O Symetrix Table of Contents Chapter 1 Introduction Chapter 2 Operator Safety Summary Chapter 3 Fast Setup Chapter 4 Front Panel Overview Chapter 5 Rear Panel Overview Chapter 6 Connecting to Other Gear Chapter 7 Signal Flow Chart Chapter 8 Troubleshooting Chapter 9 Specifications Chapter 10 Warranty and Service Chapter 11 Declaration of Conformity Rev A 15 June 1998 Symetrix part number 53305 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 reproduced or transmitted in any form or by any means electronic or mechanical including photo copying scanning recording or by any information storage and retrieval system without permission in writing from Symetrix Inc YN nn A N 10 Il 12 13 15 Symetrix 6408 216th St SW Mountlake Terrace WA 98043 USA Tel 425 778 7728 Fax 425 778 7727 Email symetrix symetrixaudio com Chapter 1 Congratulations on your purchase of the Symetrix 305 Distribution Amplifier 1x4 The 305 accepts one balanced input signal and distrib
9. Amplifier 1x4 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 ofissue Mountlake Terrace Washington USA Authorized signatyre Dane Butcher President Symetrix Incorporated Co O Symetrix O 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
10. 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 11 Declaration of Conformity Declaration of Conformity We Symetrix Incorporated 6408 216th St SW Mountlake Terrace Washington USA declare under our sole responsibility that the product 305 Distribution
11. anty 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 Le C9 O Symetrix Servicing the 305 If you have determined that your 305 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 305 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 number and a brief statement of the problem 4
12. elation between an output signal source and the input that it connects to signal receiver Signal level is very important Mismatch causes either loss of headroom or loss of signal to noise ratio Thus microphone inputs should only see signals originating from a microphone a direct DI box or an output designated microphone level output Electrically this is in the range of approximately 70 to 20 dBm Line inputs should only see signals in the 10 to 24 dBm dBu range Guitars high impedance microphones and many electronic keyboards do not qualify as line level sources The impedance relation between outputs and inputs needs to be considered but only in the following way Always make sure that a device s input impedance is higher than the output source impedance of the device that drives it Some manufacturers state a relatively high impedance figure as the output impedance of their equipment What they really mean is that this is the minimum load impedance that they would like their gear to see In most cases seeing a output impedance figure of 10 000 10K ohms or higher from modern equipment that requires power batteries or AC is an instance of this type of rating If so then the input impedance of the succeeding input must be equal to or greater than the output impedance of the driving device Symetrix equipment inputs are designed to bridge the output of whatever device drives the input i e to be greater than 10 times
13. ent choice for isolation Not only will the 303 convert the unbalanced signal to an isolated balanced signal it will also boost the 10dBV signal to the 4dBu level at which the 305 was designed to operate OUTPUTS The 305 s output is an active balanced circuit and should be used to feed balanced audio inputs Use two conductor shielded audio cable for all connections Feeding balanced inputs 1 Connect the high OUTPUT terminal of the 305 to the high of the input of the device which you are feeding 2 Connect the low OUTPUT terminal of the 305 to the low of the input of the device which you are feeding 3 Connect cable shield to the ground of the 305 and the ground connection of the device which you are feeding Le C9 O Symetrix O Symetrix Feeding unbalanced inputs WE DON T RECOMMEND IT If you must feed an unbalanced input with the 305 you should isolate the two devices with either an audio transformer or an interface matching device a match box The 305 follows the AES standards for balanced audio circuits The ground connections of the amplifier are chassis ground If you must connect the output of the 305 directly to an unbalanced input try this procedure Use two conductor shielded audio cable 1 Connect the high OUTPUT terminal of the 305 to the high of the unbalanced input 2 Make no connection to the low OUTPUT terminal of the 305 3 Connect the cable shie
14. formation 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 exclamation 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 305 i e this manual Caution To prevent electric shock do not use the polarized plug supplied with the 305 with any extension cord receptacle or other outlet unless the blades can be
15. 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 305 Note Chapter 2 Caution Identifies information that if not heeded may cause damage to the 305 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 305 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 connection 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
16. g at least 10 dBv into the aforementioned impedances The 305 s output impedance is 200 ohms balanced 100 ohms unbalanced The output line driver delivers 22 dBu into 600 ohm balanced loads or 18 dBm into 600 ohm unbalanced loads Input and Output Connections The illustration on the next page shows how to connect the 305 to balanced and unbalanced sources and loads Please remember that unbalanced operation is not recommended If you must operate the 305 from unbalanced sources run a 2 conductor shielded cable that s two conductors plus the shield from the source to the 305 At the source connect the cable connector s sleeve to one conductor this will be the or the low conductor and connect the tip to the remaining or high conductor leaving the shield unconnected Connect the shield to the chassis connection and the cable s and to the corresponding 305 input connection This is the preferred method as it makes best use of the 305 s balanced input even though the source is unbalanced An alternative shown in the illustration converts the 305 s balanced input into an unbalanced input at the input connector This works but is more susceptible to hum and buzz than the preferred method There is no level difference between methods You can drive unbalanced loads with the 305 s outputs by using the XLR connector with pin 3 left open In an emergency the show must go on you can ground pin 3 but if you have the choice leave it
17. input signal level and input level control settings The input signal may be too low If so boost the incoming signal if possible Is the input signal already noisy Listen up stream from the 305 to determine that you are feeding it a clean signal Verify that all system components on the same AC ground NoLED display Is the unit plugged in and turned on Is the AC outlet OK Is a signal of at least 10dB being fed to the input of the 305 O Symetrix Specifications Chapter 9 Architects and Engineers Specifications The Symetrix 305 Distribution Amplifier shall be a one channel audio distribution amplifier consisting of one electronically balanced input amplifier and four electronically balanced output amplifiers There shall be a master gain adjustment circuit capable of up to 15dB of gain or 15dB of loss for the purpose of optimally matching incoming signal level s There shall be a four LED array for the indication of the signal level applied to the output drive circuits The LED s shall be labelled CLIP 10 0 and 10 corresponding to internal signal levels of 18dBu 10dBu OdBu and 10dBu The output shall be capable of driving a 600 ohm balanced load to a level of 22 dBu The maximum output level into a balanced bridging load 20K Ohms shall be 26 dBu The output will offer an individual attenuator with a range of O to 20 dB Frequency response through the amplifier shall be 1 2 dB measured between 2
18. ld at the 305 s ground and at the input connector of the unbalanced input The output signal level of the 305 will be 6 dB lower when driving an unbalanced input without a transformer or matching interface device If you experience hum or noise make sure that both the 305 and the device which you are feeding are grounded on the same AC mains circuit If this is not the source of the noise problem you must isolate the balanced output from the unbalanced input with an audio transformer or matchbox Chapter 6 Connecting to Other Gear Matching Levels vs Matching Impedances In any audio equipment application the question of matching inevitably comes up Without digging a hole any deeper than absolutely necessary we offer the following discussion to hope fully clarify your understanding of the subject Over the years we have all had impedance matching pounded into our heads This is important only for vintage audio systems power amplifiers and RF Technically speaking the reason is power transfer which reaches a maximum when source and load are matched Modern audio systems are voltage transmission systems and source and load matching is not only unnecessary but undesirable as well o Vintage audio systems operate at 600 ohms or some other impedance value and must be matched both at their inputs and at their outputs Generally speaking if you are dealing with equipment that uses vacuum tubes or was designed prior to 1970 you shou
19. ld be concerned about matching These units were designed when audio systems were based on maximum power transfer hence the need for input output matching o Power amplifiers are fussy because an abnormally low load impedance generally means a visit to the amp hospital Thus it s important to know what the total impedance of the pile of speakers connected to the amplifier really is o RF systems are matched because we really are concerned with maximum power transfer and with matching the impedance of the transmission line keeps nasty things from happening Video signals composite baseband or otherwise should be treated like RF Some folks seem to believe that balanced unbalanced lines and impedances are related or even worse that they are associated with a particular type of connector Not so Unbalanced signals are not necessarily high impedance and balanced signals lines are not necessarily low impedance Similarly although 1 4 inch jacks are typically used for things like guitars which are high imped ance and unbalanced this does not predispose them to this use alone After all 1 4 inch jacks are sometimes used for loudspeakers which are anything but high impedance Therefore the presence of 3 pin XLR connectors should not be construed to mean that the input or output is low imped ance or high impedance The same applies to 1 4 inch jacks So what is really important Signal level and to a much lesser degree the impedance r
20. lified audio i e not the output of a microphone or other unamplified audio transducer 6 Turn up the INPUT level pot until the red CLIP LED just barely lights Then back the level down just a bit until the CLIP LED doesn t come on any more or only occasionally flashes 7 Now read the rest of this users guide LO OS Co O Symetrix O Symetrix Front Panel Overview Chapter 4 INPUT OUTPUTS cur O AMPLIFIER 1x4 O 10 Qe Qe QO O 0 Y ymetrix 2 5 1O Front panel drawing Input Level Controls The input level control on the 305 is marked INPUT This control adjusts it s corresponding input signal over a 30dB range With signal applied to input turn up the INPUT level pot until the red CLIP LED just barely lights Then back the level down just a bit until the CLIP LED doesn t come on any more or only occasionally flashes This is the optimum setting and will provide the greatest signal to noise ratio without distortion If your incoming signal position is unpredictable then we suggest a straight up 12 o clock setting Since the 305 s input has 18dB of headroom above 4dBu this setting should work well under most conditions Note Ifyou wish to even out the variances in signal level we recommend processing your signal with the Symetrix 421m Automatic Leveler before it reaches the 305 If you find that your input signal is very low the output ofa 10 consumer level device
21. ommon mode rejection and RF immunity Output line drivers are stable short circuit protected and de signed around industry standard 5532 type op amps The Symetrix 305 offers high quality low noise audio distribution with convenient and desirable features all at a modest price Only minimal space in your equipment rack is needed to contain this powerhouse unit 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 INPUT OUTPUTS 305 ie O lt i ae itp viy DISTRIBUTION y TO EX a EXC EXC AMPLIFIER 1x4 QO O O Enr O PWR Front panel CONNECT TO SYMETRIX PS 3 OR PS 3E POWER SUPPLY ONLY MANUFACTURED BY SYMETRIX INC LYNNWOOD WA USA 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 goel D 2 D Rear panel etrix Operator Safety Summary The in
22. or changing connections INPUT The 305 s input is balanced Of course it may be used in unbalanced configurations but for optimum system wide performance best noise rejection balanced operation is highly recom mended whenever possible Be sure to use shielded cable for both input and output connections The wire should always be two conductor plus shield even for unbalanced connections For a balanced input signal 1 Connect the incoming signal high to the INPUT terminal of the 305 2 Connect the incoming signal low to the INPUT terminal of the 305 3 Connect the incoming signal ground shield to the ground terminal of the 305 Repeat for all inputs For an unbalanced input signal using two conductor shielded cables 1 Connect the incoming signal high to the INPUT terminal of the 305 Use the red wire 2 Connect the incoming signal ground to the INPUT terminal of the 305 Use the black wire 3 Connect the cable shield at the ground connection of the 305 only If you experience hum or noise make sure that both the 305 and the device which you are feeding to the 305 s input are grounded on the same AC mains circuit If this is not the source of the noise problem you must isolate the unbalanced output from the balanced input with an audio trans former or matchbox If the unbalanced output of the device preceding the 305 is 10dBV semi pro or consumer level the Symetrix 303 Interface Amplifier is an excell
23. utes it to four independent outputs The volume of the input may be controlled via a front panel trimpot as can the volume of each individual output Distribution amplifiers are generally used to split one signal into multiple isolated sends For example a sound reinforcement engineer may wish to supply the mixer s mono output signal to the house sound system to a backstage cueing system to a DAT recorder and to a media feed The Symetrix 305 fits the bill nicely supplying four separate isolated outputs In the event that one of the outputs shorts for example the TV camera operator inadvertently plugs a shorted cord into the media feed the other three outputs continue to supply signal unaffected by the short circuit The outputs are also isolated to protect against ground hum problems The 305 s input level control allows the sound engineer to adjust the 305 s input level properly for the amount of signal being fed to it from the mixer s output The individual output level trimpots allow each of the four output levels to be tailored to their application For example an output that is being fed to the input of a DAT recorder may be adjusted to provide a signal level that optimizes recording resolution without overloading the input of the DAT recorder Introduction The Symetrix 305 also offers a four LED input level meter to assist the user in setting optimum operating levels The balanced input stage is designed for high c
24. xpense 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 purchases the product within the specified warr
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