581E Distribution Amplifier (4x4)
Contents
1. Terrace WA 98043 USA T 1 425 778 7728 F 1 425 778 7727 www SymetrixAudio com Symetrix The Vision Behind the Sound 581E Distribution Amplifier 4x4 13 User s Guide 6408 216th Street SW Mountlake Terrace WA 98043 USA Symetrix T 1 425 778 7728 F 1 425 778 7727 www SymetrixAudio com 14 The Vision Behind the Sound 581E Distribution Amplifier 4x4 15 Symetrix The Vision Behind the Sound tem No 53 0007 581E Distribution Amplifier 4x4 User s Guide 2009 Symetrix Inc All rights reserved Printed in the United States of America The information in this document 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 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 brochure may be reproduced or transmitted in any form or 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 The following are either Trademarks or Registered Trademarks2. an RA number have the serial number shipping and contact information and description of the problem ready 2 Pack the unit in its original packaging materials 3 Include your name address daytime telephone number and a brief statement of the problem Write the RA number on the outside of the box Ship the unit to Symetrix freight prepaid We do not accept freight collect shipments Just do these five things and repairs made in warranty will cost you only one way freight charges We ll pay the return freight If you don t have the factory packaging materials we recommend using an oversize box Wrap the unit in a plastic bag surround it with bubble wrap and place it in the box surrounded by Styrofoam peanuts Be sure there is enough clearance in the box to protect the rack ears We won t return the unit in anything but Symetrix packaging for which we will have to charge you If the problem is due to operator misuse or error you will have to pay for both parts and labor In any event if there are charges for the repair you will pay for the return freight All charges will be COD unless you have made other arrangements 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 6408 216th Street SW Mountlake
3. input i e to be greater than 10 times 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 anyway The two facts that you need to derive from this discussion are Match signal levels for best headroom and signal to noise ratio 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 581E 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 instrument MI equipment 10 dBV or 300 millivolts I O Impedances The 581E is designed to interface into almost any recording studio or sound reinforcement application This includes 600 Ohm systems where input and output impedances are matched Modern bridging systems where inputs bridge and outputs are low source impedances voltage transmission systems The 581E s input impedance is greater than 20k Ohms balanced The inputs may be driven from any balanced
4. much lesser degree the impedance relation 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
5. source capable of delivering at least 10 dBV into the aforementioned impedances The 581E s output impedance is 600 Ohms balanced 300 Ohms unbalanced The output line driver delivers 22 dBm into 600 Ohm balanced loads or 18 dBm into 600 Ohm unbalanced loads Input Output Connections User s Guide Input and Output Connections The illustration to the right shows how to connect the 581E to balanced and unbalanced sources and loads To operate the 581E from unbalanced sources run a 2 conductor shielded cable that s two conductors plus the shield from the source to the 581E At the source connect the low minus side to the shield these connect to the source s ground connect the high plus side to the source s signal connection At the 581E the high plus wire connects to pin 2 the low minus wire connects to pin 3 and the shield always connects to pin 1 This is the preferred method as it makes best use of the 581E s balanced input even though the source is unbalanced The other alternative shown in the illustration converts the 581E 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 either method You can drive unbalanced loads with the 581E 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 th
6. unless the prongs can be fully inserted amp Power Source This Symetrix hardware uses a switching power supply that automatically adjusts to the applied voltage Ensure that your AC mains voltage is somewhere between 100 240 VAC 50 60 Hz Use only the power cord and connector specified for the product and your operating locale A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation The appliance inlet and coupler shall remain readily operable once the apparatus has been installed gt User Serviceable Parts There are no user serviceable parts inside this Symetrix product In case of failure customers inside the U S should refer all servicing to the Symetrix factory Customers outside the U S should refer all servicing to an authorized Symetrix distributor Distributor contact information is available online at http www SymetrixAudio com Introduction First Time Setup User s Guide Introduction The Symetrix 581E Distribution Amplifier 4x4 is a four input sixteen output distribution amplifier In a typical configuration the 581E accepts four balanced input signals and distributes each input to four independent outputs The volume of each of the sixteen outputs may be individually trimmed via its front panel potentiometer Similarly the volume of each of the four inputs may be independently controlled Associated with each input is a four LED l
7. 30 dB range With signal applied to input s turn up the INPUT level pot s 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 positions are unpredictable then we suggest a straight up 12 o clock setting Since the 581E s input has 18 dB of headroom above 4 dBu this setting should work well under most conditions If you find that your input signal is very low the output of a 10 consumer level device 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 581E then turn the INPUT level control counterclockwise until the proper LED display is achieved Input LEDs Individual LED indicators show input signal levels of 10 O 10 and CLIP Output Level The sixteen output level controls on the 581E are marked OUTPUT 1A OUTPUT 1B OUTPUT 1C OUTPUT 1D OUTPUT 2A OUTPUT 2B etc Use these controls to attenuate the output level over a 20 dB 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 per
8. 5 24 cm Shipping Weight 8 Ibs Electrical Power Requirements 115 VAC nominal 95 130 VAC 50 60 Hz 230 VAC nominal 165 255 VAC 50 Hz Power Consumption 18 watts maximum Note The maximum operating ambient temperature is 25 degrees C Declaration of Conformity We Symetrix Incorporated 6408 216th St SW Mountlake Terrace Washington USA declare under our sole responsibility that the product 581E Distribution Amplifier to which this 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 January 1 2001 Place of issue Lynnwood Washington USA Authorized signature Dane Butcher President Symetrix Incorporated 11 Warranty and Service User s Guide The Symetrix Limited Warranty Symetrix Inc expressly warrants that the pr
9. 581E Distribution Amplifier 4x4 User s Guide Symetrix th lhl In IM The Vision Behind the Sound HHRHH Safety User s Guide 6408 216th Street SW Mountlake Terrace WA 98043 USA OSymetrix T 1 425 778 7728 F 1 425 778 7727 www SymetrixAudio com 2 The Vision Behind the Sound 581E Distribution Amplifier 4x4 Safety What Ships in the Box e A 581E hardware unit e A detachable power cord e 20 Euro Connectors e This User s Guide Getting Help If you have questions beyond the scope of this User s Guide contact our Customer Support Group in the following ways Tel 1 425 778 7728 8 00 am to 4 30 pm Monday through Friday Pacific Time Web http www SymetrixAudio com This device complies with part 15 of the FCC Rules Operation is subject to the following two conditions 1 This device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation This Class B Digital apparatus meets all requirements of the Canadian Interference Causing Equipment Regulations Cet appariel numerique de la classe B respecte toutes les Exigences du Reglement sur le materiel brouilleur du Canada Important Safety Instructions Read these instructions Keep these instructions Heed all warnings Follow all instructions Do not use this apparatus near water This apparatus shall not be e
10. audio inouts and outputs If you do not know how to do this forget Fast Setup and skip to the Rear Panel Overview Set INPUT level trim controls straight up 12 o clock position Set OUT level trim controls at maximum level clock wise rotation Plug the 581E into an AC outlet using the IEC type detachable power cord provided with the unit Caution Failure to connect the 581E 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 Apply line level audio signal to the input s Line level means previously amplified audio i e not the output of a microphone or other unamplified audio transducer fa Turn up the INPUT level pot s 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 Now read the rest of this User s Guide 6408 216th Street SW Mountlake Terrace WA 98043 USA T 1 425 778 7728 F 1 425 778 7727 www SymetrixAudio com Symetrix The Vision Behind the Sound 581E Distribution Amplifier 4x4 Front Rear Panel Front Panel Input Level The four input level controls on the 581E are marked INPUT 1 INPUT 2 INPUT 3 and INPUT 4 Each control adjusts it s correspond ing input signal over a
11. e choice leave it open If you must ground pin 3 it is must be grounded at the 581E 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 IMPORTANT NOTICE The wiring diagrams on this page are included for information purposes only Symetrix can not anticipate exactly what connection is needed at the non 581E end of the cable It is the user s responsibilty to determine what connection is needed In addition Symetrix accepts no responsibilty for injury or damage caused by user created wiring Terminal Strip balanced Euroblock Connector Channel Input Output Balanced Terminal Strip NOTE Detachable Euroblock connectors are designed for use with bare wire Do not tin stranded wires before inserting them into the connectors Euroblock Connector Channel Input Pin 2 Pin 2 Plus Pin 3 Pin 3 Minus Pin 1 Pin 1 Ground XLR Male Plug balanced Pin2 Pin 2 Plus Pin3 Pin3 Minus Pin1 Pin 1 Ground Euroblock Connector Channel Output TRS 1 4 Plug balanced Euroblock Connector Channel Input Output Tip Plus Ring Minus 77 Sleeve Ground Es Euroblock Connector Tip Plus Sleeve Ground ta Channel Input Tip Plus Eurobloc
12. etermine that you are feeding it a clean signal No LED display Is the unit plugged in and turned on Is the AC outlet OK Notes 6408 216th Street SW Mountlake Terrace WA 98043 USA T 1 425 778 7728 F 1 425 778 7727 www SymetrixAudio com 10 Symetrix The Vision Behind the Sound 581E Distribution Amplifier 4x4 A amp E Specs Declaration of Conformity Architects and Engineers Specifications The audio distribution amplifier shall be a four channel unit with each channel consisting of one electronically balanced input amplifier and four electronically balanced output amplifiers Associated with each channel shall be a master gain adjustment circuit capable of up to 15 dB of gain or 15 dB of loss for the purpose of optimally matching incoming signal level s Also associated with each channel shall be a four LED array for the indication of the signal levels applied to the output drive circuits The LED s shall be labelled CLIP 10 O and 10 corresponding to internal signal levels of 18 dBu 10 dBu O dBu and 10 dBu Each output shall be capable of driving a 600 Ohm balanced load to a level of 22 dBm The maximum output level into a balanced bridging load 20k Ohms shall be 26 dBu Each output will offer an individual attenuator with a range of O to 20 dB Frequency response through the amplifier shall be 2 dB measured between 20 Hz and 20 kHz THD Noise shall be less than 0 009 measured at unit
13. evel meter to assist the user in setting optimum operating levels The balanced input stages are designed for high common mode rejection and RF immunity Output line drivers are stable short circuit protected and designed around industry standard 5532 type op amps The 581E operates from an internal power supply built around a low magnetic field toroidal transformer resulting in a very low noise high performance product The 4x4 architecture of the 581E allows the amplifier to fit the greatest possible number of configurations Each one input four output module is independent of the others Wiring the 581E s inputs to four separate audio sources provides four mono distribution channels with four outputs each This configuration also accommodates two stereo audio feeds Stereo audio can be distributed to eight inputs by strapping the 581E s inputs together in pairs Left channel audio is wired to inputs 1 and 2 while the right channel connects to inputs 3 and 4 The 581E distributes a single mono audio source to all 16 outputs when all inputs are strapped together Regardless of your audio distribution requirements the Symetrix 581E solves the problem with minimum cost and no wasted outputs Fast First Time Setup Follow these instructions to get your 581E up and running as quickly as possible The intent of this section is fast setup Refer to later chapters for explanation of the 581E s controls and functions Connect
14. formance it s best to leave the controls wide open full clockwise for the hottest possible output signals AS Red LED indicates power on REAR Panel IEC Connector Connect the proper IEC power cable supplied for your locale Connect only to appropriate AC power source Refer to rear panel marking for correct AC source voltage Inputs Outputs The 581E is fitted with Euroblock style connectors for both inputs and outputs NOTE Detachable Euroblock connectors are designed for use with bare wire Do not tin stranded wires before inserting them into the connectors Making the Connections User s Guide Inputs The four 581E inputs are balanced Of course they may be used in unbalanced configurations but for optimum system wide performance best noise rejection balanced operation is highly recommended Use shielded cable for both input and output connections The wire should always be two conductor plus shield even for unbalanced connections For balanced input signals gt Connect the incoming signal high to the INPUT terminal of the 581E gt Connect the incoming signal low to the INPUT terminal of the 581E gt Connect the incoming signal ground shield to the ground terminal of the 581E Repeat for all inputs gt For unbalanced input signals using two conductor shielded cables gt Connect the incoming signal high to the INPUT terminal of
15. g to qualified service personnel Servicing is required when the apparatus has been damaged in any way Such as power supply cord or plug cord is damaged liquid has been spilled or objects have fallen into the apparatus the apparatus has been exposed to rain or moisture does not operate normally or has been dropped CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN TO REDUCE THE RISK OF FIRE OR WARN NG ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE AVI RISQUE DE CHOC ELECTRIQUE 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 competent gt 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 persons The exclamation point within an equilateral triangle is intended to alert the user of the presence of important operating and maintenance servicing instructions in the literature accompanying the product i e this Quick Start Guide CAUTION To prevent electric shock do not use the polarized plug supplied with the unit with any extension cord receptacle or other outlet
16. ies 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 orofessional 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 merchantability and fitness for a particular purpose This limited warranty with all terms conditions and disclaimers set forth herein shall extend to the original purchaser and anyone who purchases 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 additional 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 Note Some Symetrix products contain embedded software and may also be accompanied by control software intended to be run ona personal computer Said software is specifically excluded from this warranty Limitation of Liability The total liability of Symetrix on any claim whether in contract tort including negligence or otherwise arising out of connected with o
17. igned prior to 1970 you should be concerned about matching These units were designed when audio systems were based on maximum power transfer hence the need for input output matching 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 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 impedance and unbalanced this does not predispose them to only this usage 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 impedance or high impedance The same applies to 1 4 inch jacks So what is really important Signal level and to a
18. k Sleeve Ground Connector ba Channel Output 6408 216th Street SW Mountlake Terrace WA 98043 USA T 1 425 778 7728 F 1 425 778 7727 www SymetrixAudio com Symetrix The Vision Behind the Sound 581E Distribution Amplifier 4x4 Block Diagram The 581E Block Diagram CHANNEL 1 De ME INPUT DEE LEVEL OUTPUT 1A LEVEL A OUTPUT 1B LEVEL A CHANNEL 1 INPUT LED DISPLAY OUTPUT 1C LEVEL A OUTPUT 1D LEVEL A CHANNEL 1 Troubleshooting User s Guide No output Check cables and connections Are inputs driven by outputs and outputs driving inputs Verify cables source and load by patching input and output connections together at the unit Check for AC power presence Hum or buzz in output Check input and output connector wiring 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 581E s LED display s 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 581E to make sure you re feeding it a clean signal Noise hiss Check input signal levels 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 581E to d
19. oduct will be free from defects in material and workmanship for eighteen 18 months from the date the product is shipped from the factory 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 eighteen 18 months from the date the product is shipped from the factory 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 via United Parcel Service by Symetrix to any location within the Continental United States 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 expressly disclaims any IMPLIED warrant
20. of Symetrix Inc Symetrix SymNet SymNet Designer SymLink and CobraLink Windows is a Registered Trademark of Microsoft Inc Other product names mentioned herein may be trademarks and or registered trademarks of other companies and are property of their respective owners 6408 216th Street SW Mountlake Terrace WA 98043 USA T 1 425 778 7728 F 1 425 778 7727 www SymetrixAudio com
21. r resulting from the manufacture sale delivery resale repair replacement or use of any product will not exceed the price allocatable to the product or any part thereof which gives rise to the claim In no event will Symetrix be liable for any incidental 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 installation or removal of products substitute facilities or supply houses Servicing Your Symetrix Product If you have determined that your Symetrix product 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 Return Authorization At the Symetrix factory Symetrix will perform in warranty or out of warranty service on any product it has manufactured for a period of three 8 years from date of discontinued manufacture Before sending anything to Symetrix please contact our Customer Service Department for a Return Authorization RA number The telephone number is 1 425 778 7728 Additionally support is available via the web site http support SymetrixAudio com In warranty Repairs To get your Symetrix product repaired under the terms of the warranty 1 Call us for
22. r matching interface device If you experience hum or noise make sure that both the 581E 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 6408 216th Street SW Mountlake Terrace WA 98043 USA T 1 425 778 7728 F 1 425 778 7727 www SymetrixAudio com Symetrix The Vision Behind the Sound 581E Distribution Amplifier 4x4 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 hopefully 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 Vintage audio systems operate at 600 Ohms or some other impedance value and must be matched both at their inouts and at their outputs Generally speaking if you are dealing with equipment that uses vacuum tubes or was des
23. the 581E Use the red wire gt Connect the incoming signal ground to the INPUT terminal of the 581E Use the black wire gt Connect the cable shield at the ground connection of the 581E only If you experience hum or noise make sure that both the 581E 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 unbalanced output from the balanced input with an audio transformer or matchbox Wiring the 581E in 2x8 or 1x16 configuration To connect the 581E as a 2 input 8 output dis tribution amplifier proceed as follows gt Connect the two incoming signals to INPUT 1 and INPUT 2 as per the instructions above gt Connect 4 additional short pieces of 20 or 22 gauge wire as follows gt INPUT 1 to INPUT 3 gt INPUT 1 to INPUT 3 gt INPUT 2 to INPUT 4 gt INPUT 2 to INPUT 4 To connect the 581E as a 1 input 16 output distribution amplifier proceed as follows gt Connect the single incoming signal to INPUT 1 as per the instructions above gt Connect 6 additional short pieces of 20 or 22 gauge wire as follows INPUT 1 to INPUT 2 INPUT 2 to INPUT 3 INPUT 3 to INPUT 4 INPUT 1 to INPUT 2 INPUT 2 to INPUT 3 INPUT 3 to INPUT 4 v v v v v vy O
24. utputs The 581E s four outputs are active balanced circuits and should be used to feed balanced audio inputs Use two conductor shielded audio cable for all connections Feeding balanced inputs gt Connect the high OUTPUT terminal of the 581E to the high of the input of the device which you are feeding gt Connect the low OUTPUT terminal of the 581E to the low of the input of the device which you are feeding gt Connect cable shield to the ground of the 581E and the ground connection of the device which you are feeding Feeding unbalanced inputs WE DON T RECOMMEND IT If you must feed an unbalanced input with the 581E you should isolate the two devices with either an audio transformer or an interface matching device a matchbox The 581E 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 581E directly to an unbalanced input try this procedure Use two conductor shielded audio cable gt Connect the high OUTPUT terminal of the 581E to the high of the unbalanced input Make no connection to the low OUTPUT terminal of the 581E gt Connect the cable shield at the 581E s ground and at the input connector of the unbalanced input The output signal level of the 581E will be 6 dB lower when driving an unbalanced input without a transformer o
25. xposed to dripping or splashing and no objects filled with liquids such as vases shall be placed on the apparatus Clean only with dry cloth Do not block any ventilation openings Install only in accordance with the manufacturer s instructions Do not install near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat This apparatus shall be connected to a mains socket outlet with a protective earthing connection Do not defeat the safety purpose of the polarized or grounding type plug A polarized plug has two blades with one wider than the other A grounding type plug has two blades and a third grounding prong The wide blade or the third prong are provided for your safety If the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet Protect the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the apparatus Only use attachments accessories specified by the manufacturer Use only with the cart stand tripod bracket or table specified by the manufacturer or sold with the apparatus v When a cart is used use caution when moving the cart apparatus combination to avoid injury from tip over Unplug this apparatus during lightning storms or when unused for long periods of time Refer all servicin
26. y gain with a bandwidth 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 one rack space 1U The physical dimensions shall be 1 72 H x 19 W x 6 D 4 45cm H x 43 7cm W x 15 24cm D The distribution amplifier shall operate by means of its built in power supply connected to 115 VAC nominal 95 130 VAC 50 60 Hz or 230 VAC nominal 165 255 VAC 50 Hz Power consumption shall be 18 watts maximum There shall be a rear panel receptacle for an IEC type detachable power cord The distribution amplifier shall carry the CE mark The distribution amplifier shall be a Symetrix Inc model 581E Distribution Amplifier 4x4 Specifications Input Output Maximum Input Level Maximum Output Level 26 dBu Balanced 26 dBu Balanced 20k Ohm load 22 dBm 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 dB 20 Hz 20 kHz lt 009 unity gain input to output 30 kHz measurement bandwidth gt 100 dB A weighted ref to 4 dBu gt 125 dB A weighted gt 40 dB 20 Hz 20 kHz Signal to Noise Ratio Dynamic Range Common Mode Rejection Input Gain Range 15 dB Output Gain Range 0 to 20 dB Connections All Inputs and Outputs Euroblock Power In IEC 3 prong jack Physical Size hwd 1 72 x 19 x 6 in 4 37 x 48 26 x 1
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