304 Headphone Amplifier - Symetrix
304 Headphone AmplifierUser’s Guide
Safety6408 216th Street SW Mountlake Terrace, WA 98043 USAT 1.425.778.7728 F 1.425.778.7727 www.SymetrixAudio.comUser’s Guide2
Safety304 Headphone AmplifierWhat Ships in the Box A 304 hardware unit. One PS-3 (115 VAC), PS-3E (230 VAC)power supply. This User’s Guide.If you have questions beyond the scopeof this Quick Start Guide or the helpmodule, contact our Customer SupportGroup in the following ways:Tel:Important SafetyInstructions!@# % 1 (425) 778-77288:00 am to 4:30 pmMonday through Friday, &Pacific TimeWeb: http://www.SymetrixAudio.comThis device complies with part 15 ofthe FCC Rules. Operation is subjectto the following two conditions: (1)This device may not cause harmfulinterference, and (2) this device mustaccept any interference received,including interference that may causeundesired operation.Cet appariel numerique de la classeB respecte toutes les Exigences duReglement sur le materiel brouilleurdu Canada.Read these instructions.Keep these instructions.Heed all warnings.TO REDUCE THE RISK OF FIRE ORSHOCK DO NOT EXPOSEWARNING: ELECTRICTHIS EQUIPMENT TO RAIN OR MOISTUREDE CHOC ELECTRIQUEAVIS: RISQUENE PAS OUVRIRFollow all instructions.Do not use this apparatus near water.This apparatus shall not be exposed todripping or splashing and no objectsfilled with liquids, such as vases, shall beplaced on the apparatus.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 reparée l’usager.S’adresser a un reparateur compétent.GThe lightning flash with arrowheadsymbol within an equilateral triangle isintended to alert the user of the presenceof uninsulated “dangerous voltage”within the product’s enclosure that maybe of sufficient magnitude to constitutea risk of electric shock to persons. Theexclamation point within an equilateraltriangle is intended to alert the user ofthe presence of important operating andmaintenance (servicing) instructions in theliterature accompanying the product (i.e.this Quick Start Guide).GCAUTION: To prevent electric shock,do not use the polarized plug suppliedwith the unit with any extension cord,receptacle, or other outlet unless theprongs can be fully inserted.GPower Source: This Symetrix hardwareuses a switching power supply thatautomatically adjusts to the appliedvoltage. Ensure that your AC mainsvoltage is somewhere between 100-240VAC, 50-60 Hz. Use only the powercord and connector specified for theproduct and your operating locale. Aprotective ground connection, by way ofthe grounding conductor in the powercord, is essential for safe operation. Theappliance inlet and coupler shall remainreadily operable once the apparatus hasbeen installed.GUser Serviceable Parts: There are nouser serviceable parts inside this Symetrixproduct. In case of failure, customersinside the U.S. should refer all servicing tothe Symetrix factory. Customers outsidethe U.S. should refer all servicing to anauthorized Symetrix distributor. Distributorcontact information is available online at:http://www.SymetrixAudio.com.Clean only with dry cloth.Do not block any ventilation openings.Install only in accordance with themanufacturer’s instructions.*Do not install near any heat sources suchas radiators, heat registers, stoves, orother apparatus (including amplifiers) thatproduce heat.(This apparatus shall be connected toa mains socket outlet with a protectiveearthing connection. Do not defeatthe safety purpose of the polarized orgrounding-type plug. A polarized plug hastwo blades with one wider than the other.A grounding type plug has two bladesand a third grounding prong. The wideblade or the third prong are provided foryour safety. If the provided plug does notfit into your outlet, consult an electricianfor replacement of the obsolete outlet.This Class B Digital apparatus meetsall requirements of the CanadianInterference-Causing EquipmentRegulationsCAUTIONRISK OF ELECTRIC SHOCKDO NOT OPENBLProtect the power cord from beingwalked on or pinched particularly atplugs, convenience receptacles, and thepoint where they exit from the apparatus.BMOnly use attachments/accessoriesspecified by the manufacturer.BNUse only with the cart, stand,tripod, bracket, or tablespecified by the manufacturer,or sold with the apparatus.When a cart is used, usecaution when moving the cart/apparatus combination to avoid injuryfrom tip-over.BOUnplug this apparatus during lightningstorms or when unused for long periodsof time.BPRefer all servicing to qualified servicepersonnel. Servicing is required whenthe apparatus has been damaged in anyway, such as power-supply cord or plugcord is damaged, liquid has been spilledor objects have fallen into the apparatus,the apparatus has been exposed to rainor moisture, does not operate normally, orhas been dropped.3
First Time SetupUser’s GuideIntroductionThe Symetrix 304 Headphone Amplifier is a 1-in / 4-outamplifier designed to drive multiple headphones of anyimpedance. Symetrix proprietary high voltage drivetechnology gives the 304 the ability to drive high impedanceheadphones with the equivalent output voltage of a muchlarger power amplifier, yet provides more than amplecurrent for low impedance phones. The four stereo outputsautomatically adjust output power to match the loadimpedance.with a stereo input provides a quick check of the monocompatibility of a stereo mix. For that matter, you may wantto monitor in mono.As a mono amplifier, one signal fed to either input will feedboth out puts. Also in mono mode, when two different monosignals are fed to the left and right inputs, they will be mixedto feed both the left and right outputs.The inputs are electronically balanced, but will operatenormally in an unbalanced configuration when 2-conductor1/4 inch plugs are inserted. The outputs are 1/4 inch stereoconnectors.Controls provided are input level, output level for eachindividual amplifier, and a stereo/mono switch.The Stereo/Mono switch allows the amplifier to be usedseveral ways. As a “normal” stereo amplifier (with fouroutputs), the left and right inputs are used for stereo signals,which feed the left and right outputs. Switching to monoFast First Time SetupWiringGo!To install the 304:Set the individual level controls to minimum (max ccwrotation). Set the master level control to the halfway position(12 noon). Set the stereo/mono switch as appropriate.Plug the PS-3 power supply’s DIN connector into the 304.Plug the PS-3 into a suitable source of AC power. Refer tothe labelling on the PS-3 to determine what is suitable.With the source signal active, adjust the individual levelcontrols for comfortable listening levels.Connect your source to the 304’s tip-ring-sleeve input jacks.The inputs are balanced. They will work with either balancedor unbalanced sources.Warning: The 304 is capable of driving manyheadphones past the threshold of pain. This can alsoresult in hearing damage. For your own hearinghealth, monitor at the lowest SPL that you canuse and still get the job done.Connect your headphones to the four output jacks. The 304can handle headphone impedances ranging from 8 Ohms toover 2000 Ohms. 60 Ohm headphones are optimal (they getthe loudest). It is not necessary for each set of headphonesto be the same (although it might help if they were).6408 216th Street SW Mountlake Terrace, WA 98043 USAT 1.425.778.7728 F 1.425.778.7727 www.SymetrixAudio.com4
Front/Rear Panel Overview304 Headphone AmplifierFront PanelItemDescriptionInput LevelSets the input signal strength. Fully counterclockwise, no signal. Fully clockwise, input signals are boosted by 20 dB.Mono/StereoCombines stereo, or two mono, input signals into one mono output signal (fed equally to both left and right headphone outputs).Headphone Outputs1/4" stereo jacks for headphones. The minimum impedance is 8 Ohms (see Table 1 for combined headphone impedances).Headphone LevelsVolume controls set the signal strength at the corresponding output jack (1-4).PowerRed LED indicates power “on”.Rear PanelItemDescription7-pin DIN ConnectorConnect the 7-pin DIN plug end of a Symetrix PS-3 (115 VAC) or PS-3E (230 VAC) here. Connect the AC powerconnector end of the PS-3 or PS-3E to an AC power source that is of the correct voltage and frequency as markedon the PS-3 or PS-3E.Thru ATRS jack connected in parallel with Input A jack. Use this jack to connect to other 304’s or other audio equipment.Thru BTRS jack connected in parallel with Input B jack. Use this jack to connect to other 304’s or other audio equipment.Input A (Left channel)3 conductor 1/4" jack for line level balanced or unbalanced input signals. Tip high ( ), Ring low (-),Sleeve ground.Input B (Right channel)3 conductor 1/4" jack for line level balanced or unbalanced input signals. Tip high ( ), Ring low (-),Sleeve ground.5
Using the 304User’s GuideImpedance, Sensitivity, LoudnessIf low and high impedance headphones are combined on thesame channel, the low impedance headphones will be muchlouder. As a result, when a combination of high impedanceand low impedance headphones is used, only those oflike impedance should be used on the same channel. Thisallows each listener to properly adjust loudness, withoutregard to the impedance and sensitivity of the other head phones. (It’s ok to mix impedances on the same amplifier, it’sjust not optimum. You won’t hurt anything.)Loudness is directly related to the impedance andsensitivity of the headphones. Impedance determines howmuch power the headphones will draw, while sensitivityindicates how much of the electrical signal delivered to theheadphones is converted into sound.Because low impedance headphones draw more powerfrom the am plifier they will sound louder, at the samecontrol settings, than high impedance headphones. Also,headphones of higher sensitivity will sound louder than thoseof lower sensitivity. Check the manufacturer’s spec sheet forimpedance and sensitivity information.Maximum Amplifier LoadThe minimum operating impedance, or maximum load,for each output of the 304 is 8 Ohms. Use as many pairsof headphones as desired, as long as the total combinedimpedance (per output) does not fall below 8 Ohms. Table 1shows how many headphones of various impedances maybe used with each output of the 304.Proprietary high voltage driver technology allows the 304 todrive even high impedance headphones to maximum levels,be cause the amplifiers are capable of very high outputvoltage swing. However, to get a loudness equivalent tothat of low impedance head phones, the controls will haveto be set to higher settings when using high impedanceheadphones. This is normal.Table 1 - Combined Impedance Values(approx. 8)Impedance of HeadphonesMaximum Number/Channel8 (see note 1)1162324100102002040040600606408 216th Street SW Mountlake Terrace, WA 98043 USAT 1.425.778.7728 F 1.425.778.7727 www.SymetrixAudio.com6
Applications304 Headphone AmplifierThe 304 can be used in the following applications. Please note that this list is far from comprehensive and yourimagination may create new uses that we haven’t listed here.Project Studio:Broadcast:Live Sound:House of Worship:BalancedLine Driver:Let the 304 expand your mixer’s headphone capacity. You can drive it via atip-ring-sleeve to dual tip-sleeve cable from your mixer’s headphone jack,or from one or two of your mixer’s aux sends. If you only use one aux send,then press the stereo/mono switch to route the signal to both channels.Use the 304 to drive the guest headphones in your studio. Doesyour console have an anemic headphone amplifier?Does your console have an anemic headphone amplifier?Create assistive listening stations at several pews. Drive the 304with a mixture of the sound reinforcement signal and a roommicrophone. No, this isn’t as sophisticated as one of the RF orinfrared systems, but it doesn’t cost like they do either!Here’s how to use the 304 as a one-in, four out balanced line amplifier.Make a “Y” cable so that you can drive both inputs in parallel. Wire the plug forthe right-channel input so that it is reverse polarity from the left-channel input.Connect your source to the “Y” cable’s input. Connect each of your balancedloads to the tip-ring-sleeve output connectors. The tip connection is hot.7
Block DiagramUser’s GuideHEADPHONELEVEL 1LINEINPUT AEMIFILTERCIRCUITRYHIGHVOLTAGEAMPMODEMONO / STEREOPASSTHRU ALINEINPUT DPHONELEVEL 2HIGHVOLTAGEAMPHEADPHONELEVEL 3HEADPHONELEVEL 4T 1.425.778.7728 F 1.425.778.7727 www.SymetrixAudio.comHIGHVOLTAGEAMPHEADPHONEOUTPUT 1HIGHVOLTAGEAMPHIGHVOLTAGEAMPHEADPHONEOUTPUT 2INPUTLEVELPASSTHRU B6408 216th Street SW Mountlake Terrace, WA 98043 PHONEOUTPUT 3HIGHVOLTAGEAMPHIGHVOLTAGEAMPHEADPHONEOUTPUT 4
Troubleshooting304 Headphone AmplifierTroubleshooting ChartSymptomNo output:Hum or buzz in output:Distortion:Noise (hiss):No LED display:Probable CauseCheck cables and connections. Are inputs driven by outputs, and outputsdriving inputs? Verify cables, source and load. Check for AC power presence.Check input and output connector wiring. Ground loop: check related systemequipment grounding. Are all system components on the same AC ground?Check input signal. Is it too hot, or is it already distorted?Check the output loading. Is something else clipping?Check input signal levels. The 304 is intended to operate at or near“line” level ( 4dBu is nominal) Make sure that the signal you are feedingto the 304 is a line level signal, not mic level. Make sure that all systemscomponents are on the same AC ground. Check gain settings onupstream equipment. The system gain structure should be such that the304 receives 4dBu nominal signal. Is the input signal already noisy?Is the unit plugged in? Is the AC outlet OK?NOTES:9
Specs Declaration of ConformityUser’s GuideArchitects and Engineers SpecificationsThe headphone amplifier shall have a single stereo input and four stereo outputs. Each output shall have its own amplifier and volume control. Anoverall volume control (master) shall also be provided. There shall be an overall stereo/mono switch.All inputs are balanced bridging inputs. Outputs shall be suitable for driving headphones in the range of 8 Ohms to 2000 Ohms. The output sourceimpedance shall be 100 Ohms.The headphone amplifier shall be capable of delivering 35 volts peak-to-peak into a 2000 Ohm load (or greater).The unit shall be capable of operating by means of a Symetrix PS-3 or PS-3E external power supply connected to 115 VAC nominal (95 to 130VAC), 50/60 Hz or 230 VAC nominal, 207 to 253 VAC, 50 Hz where applicable.The unit shall be a Symetrix, Inc. model 304 Headphone Amplifier.Declaration of ConformitySpecificationsWe, Symetrix Incorporated, 6408 216th St. SW, Mountlake Terrace,Washington, USA, declare under our sole responsibility that theproduct:INPUT/OUTPUTInput Type.Bridging, Balanced or Unbalanced304 Headphone Amplifierto which this declaration relates, is in conformity with the followingstandards:Maximum Input Level. 18 dBu BalancedMaximum Output Level. 21 dBm, 600 Ohm load, 6 VRMS, 200 Ohm loadEN 60065Safety requirements for mains operated electronic and relatedapparatus for household and similar general use.Input Impedance. 20k Ohms Balanced, 10k Ohms UnbalancedEN 50081-1Electromagnetic compatibility - Generic emission standardOutput Impedance. 100 OhmsPart 1: Residential, commercial, and light industry.Performance DataEN 50082-1Electromagnetic compatibility - Generic immunity standardFrequency Response. 20 Hz to 20 kHz, 0, -1 dBPart 1: Residential, commercial, and light industry.The technical construction file is maintained at:THD Noise. .01% (1kHz, 0 dBm, 600 Ohms)Symetrix, Inc.02% (1kHz, 20 dBm, 600 Ohms)6408 216th St. SWMountlake Terrace, WA, 98043 USASignal-to-Noise Ratio. 95 dBThe authorized representative located within the European Communityis:Maximum Gain. 25 dBWorld Marketing AssociatesCONNECTIONSP.O. Box 100Input. 1/4" TRSSt. Austell, Cornwall, PL26 6YU, U.K.Output. 1/4" TRSPlace of issue: Lynnwood, Washington, USADate of issue: October 31, 1998Authorized signature:Power In.7-pin DINPHYSICALSize (hwd). ½ rack unit1.75 x 8.5 x 6.5 in., 4.445 x 21.59 x 15.875 cm.Shipping Weight. 4.5 lbsDane Butcher, President, Symetrix Incorporated.ELECTRICALPower Requirements.115 VAC nominal, 95 to 130 VAC, 50 to 60 Hz230 VAC nominal, 207 to 253 VAC, 50 Hz6408 216th Street SW Mountlake Terrace, WA 98043 USAT 1.425.778.7728 F 1.425.778.7727 www.SymetrixAudio.com10
Warranty and Service304 Headphone AmplifierThe Symetrix Limited WarrantyServicing Your Symetrix ProductSymetrix, Inc. expressly warrants that the product will be free fromdefects in material and workmanship for eighteen (18) months fromthe date the product is shipped from the factory. Symetrix’s obligationsunder this warranty will be limited to repairing or replacing, at Symetrix’soption, the part or parts of the product which prove defective in materialor workmanship within eighteen (18) months from the date the productis shipped from the factory, provided that the Buyer gives Symetrixprompt notice of any defect or failure and satisfactory proof thereof.Products may be returned by Buyer only after a Return Authorizationnumber (RA) has been obtained from Symetrix. Buyer will prepay allfreight charges to return the product to the Symetrix factory. Symetrixreserves the right to inspect any products which may be the subject ofany warranty claim before repair or replacement is carried out. Symetrixmay, at its option, require proof of the original date of purchase (datedcopy of original retail dealer’s invoice). Final determination of warrantycoverage lies solely with Symetrix. Products repaired under warranty willbe returned freight prepaid via United Parcel Service by Symetrix, to anylocation within the Continental United States. Outside the ContinentalUnited States, products will be returned freight collect.If you have determined that your Symetrix product requires repairservices and you live outside of the United States please contact yourlocal Symetrix dealer or distributor for instructions on how to obtainservice. If you reside in the U.S. then proceed as follows:Return AuthorizationAt the Symetrix factory, Symetrix will perform in-warranty or out-ofwarranty service on any product it has manufactured for a period ofthree (3) years from date of discontinued manufacture.Before sending anything to Symetrix, please contact our CustomerService Department for a Return Authorization (RA) number. Thetelephone number is 1 (425) 778-7728. Additionally, support isavailable via the web site: http://support.SymetrixAudio.com.In-warranty RepairsTo get your Symetrix product repaired under the terms of the warranty:The foregoing warranties are in lieu of all other warranties,whether oral, written, express, implied or statutory. Symetrix, Inc.expressly disclaims any IMPLIED warranties, including fitnessfor a particular purpose or merchantability. Symetrix’s warrantyobligation and buyer’s remedies hereunder are SOLELY andexclusively as stated herein.This Symetrix product is designed and manufactured for use inprofessional and studio audio systems and is not intended forother usage. With respect to products purchased by consumers forpersonal, family, or household use, Symetrix expressly disclaimsall implied warranties, including but not limited to warranties ofmerchantability and fitness for a particular purpose.1.Call us for an RA number (have the serial number, shipping andcontact 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 abrief 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 acceptfreight collect shipments.Just do these five things, and repairs made in-warranty will cost you onlyone way freight charges. We’ll pay the return freight.If you don’t have the factory packaging materials, we recommend usingan oversize box. Wrap the unit in a plastic bag, surround it with bubblewrap, and place it in the box surrounded by Styrofoam peanuts. Be surethere is enough clearance in the box to protect the rack ears. We won’treturn the unit in anything but Symetrix packaging for which we will haveto charge you. If the problem is due to operator misuse or error, you willhave to pay for both parts and labor. In any event, if there are chargesfor the repair, you will pay for the return freight. All charges will be CODunless you have made other arrangements (prepaid, Visa or Mastercard).This limited warranty, with all terms, conditions and disclaimers set forthherein, shall extend to the original purchaser and anyone who purchasesthe product within the specified warranty period.Symetrix does not authorize any third party, including any dealer orsales representative, to assume any liability or make any additionalwarranties or representation regarding this product information on behalfof Symetrix.Out-of-warranty RepairsThis limited warranty gives the buyer certain rights. You may haveadditional rights provided by applicable law.If the warranty period has passed, you’ll be billed for all necessary parts,labor, packaging materials, and freight charges. Please remember, youmust call for an RA number before sending the unit to Symetrix.Note: Some Symetrix products contain embedded software and mayalso be accompanied by control software intended to be run on apersonal computer. Said software is specifically excluded fromthis warranty.Limitation of LiabilityThe total liability of Symetrix on any claim, whether in contract, tort(including negligence) or otherwise arising out of, connected with, orresulting from the manufacture, sale, delivery, resale, repair, replacementor use of any product will not exceed the price allocatable to theproduct or any part thereof which gives rise to the claim. In no event willSymetrix be liable for any incidental or consequential damages includingbut not limited to damage for loss of revenue, cost of capital, claims ofcustomers for service interruptions or failure to supply, and costs andexpenses incurred in connection with labor, overhead, transportation,installation or removal of products, substitute facilities or supply houses.11
Item No. 53-0001304 Headphone Amplifier 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 damagesresulting from the furnishing, performance, or use of this material. Mention of third-party products is for informational purposes only and constitutesneither an endorsement nor a recommendation. Symetrix assumes no responsibility with regard to the performance or use of these products. Undercopyright laws, no part of this brochure may be reproduced or transmitted in any form or by any means, electronic or mechanical, without permissionin writing from Symetrix, Inc. If, however, your only means of access is electronic, permission to print one copy is hereby granted. The following areeither Trademarks or Registered Trademarks of Symetrix, Inc.: Symetrix, SymNet, SymNet Designer, SymLink and CobraLink. Windows is a RegisteredTrademark of Microsoft, Inc. Other product names mentioned herein may be trademarks and/or registered trademarks of other companies and areproperty of their respective owners.6408 216th Street SW Mountlake Terrace, WA 98043 USAT 1.425.778.7728 F 1.425.778.7727 www.SymetrixAudio.com
The Symetrix 304 Headphone Amplifier is a 1-in / 4-out amplifier designed to drive multiple headphones of any impedance. Symetrix proprietary high voltage drive technology gives the 304 the ability to drive high impedance headphones with the equivalent output voltage of a
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HPRIN 30 Headphone amplifier right input HPROUT 31 Headphone amplifier right output HPVCC 32 5V supply to headphone amplifier and logic. This terminal is typically connected to HPREG. LCOMP 6 Compensation capacitor terminal for left-channel Class-D amplifier LINN 4 Class-D left-channel negative input LINP 5 Class-D left-channel positive input
TPA6132A2 25-mW DirectPath Stereo Headphone Amplifier With Pop Suppression 1 Features 3 Description The TPA6132A2 (sometimes referred to as TPA6132) 1 Patented DirectPath Technology Eliminates Need for DC-Blocking Capacitors is a DirectPath stereo headphone amplifier
Headphone Amplifier NCP2815 is a dual LongPlay true ground headphone amplifier designed for portable communication device applications such as mobile phones. This part is capable of delivering 26 mW of continuous average power into a 32 load from a 1.8 V power supply with a THD N of 1%. Based
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BEHRINGER HA8000 POWERPLAY-PRO8 8-CHANNEL HEADPHONE AMP A professional, high-power, multi-purpose 8-channel headphone distribution ampli-fier. It features eight totally independent stereo amplifier sections in one rack space, 2 separate main inputs, 2 headphone outputs per channel and even a dedi-cated direct input for each channel.
MODULATORS AND 1-F AMPLIFIERS . Mobile Modulator-25-Watt Modulator-60-MC 1-F Amplifier-25-Watt Modulator-100-Watt Modulator-I2.5-MC 1-F Amplifier -5.5-MC 1-F Amplifier-JO-MC 1-F Amplifier SECTION 5 MISCELLANEOUS CIRCUITS Signaling System-Mobile Public-Address System-5-Watt 150-MC Amplifier-Squelch Amplifier-I60-MC Power Amplifier-Auto
day I am going to buy a car just like that.'' He thei1 explained : ''You see, mister, Harm can't waJk. I go downtow11. and look at' all e nice Tiiii;-J(S in the store window, and come home and try tc, tell Harry what it is all about, but r tell it very good. Some day J am going to make
