Meyer Sound USW-1P Manuale utente

Operating Instructions

USW-1P

(Serial Numbers 981000 and above)

Self-Powered Subwoofer

Meyer Sound Laboratories, Inc.

PN: 05.078.008.01 B

Keep these important operating instructions.

Contents

Pour indiquer les risques

résultant de tensions

dangereuses

Zu die gefahren von

gefährliche spanning zeigen

Important operating

instructions

Pour indequer important

instructions

Zu wichtige betriebs-

anweisung und unter-

haltsanweisung zeigen

Frame or chassis

Masse châssis

Rahmen oder chassis

Protective earth ground

Terre de protection

Die schutzerde

Para indicar azares provengo

de peligroso voltajes

Para indicar importante

funcionar y mantenimiento

instrucciones

Armadura o chassis Tierra proteccionista

These symbols indicate important safety or operating features in this booklet and on the chassis

Dangerous voltages:

risk of electric shock

Symbols Used

Introduction 3

AC Power 3

The Modular Rear Panel 5

Amplification, Limiting, and Cooling System 6

Rigging 6

Full-Range Systems 7

Verifying Driver Polarity 9

Troubleshooting 1 0

Safety Summary 1 1

Rear Panel and Input Modules Drawings 1 2

Dimensions Back Cover

Declaration of Conformity According to ISO/IEC Guide and EN 45014

Safety: EN60065: 1994

EMC: EN55103-1 emmission

EN55103-2 immunity

Name: Meyer Sound Laboratories, Inc.

Address: 2832 San Pablo Avenue

Berkeley, California 94702-2204, USA

The Manufacturer:

Conforms to the following Product Specifications:

Declares that the product:

The product herewith complies with the requirements

of the Low Voltage Directive 73 / 23 / EEC and

the EMC Directive 89 / 336 / EEC.

Office of Quality Manager

Berkeley, California USA

October 1, 1994

Environmental Specifications for

Meyer Sound Electronics Products:

Operating temperature: 0oto + 45o

Nonoperating temperature: < -40o C or > +75oC

Humidity: to 95% at 35oC

Operating Altitude: to 4600 m (15,000 ft)

Nonoperating altitude: to 6300 m (25,000 ft)

Shock: 30g 11 msec half-sine

on each of 6 sides

Vibration: 10 Hz to 55 Hz (0.010m

peak-to-peak excursion)

®®

LISTED

3K59

COMMERCIAL

AUDIO SYSTEM

Product Name: UPA-1P, UPA-2P, UM-1P, USW-1P, UM-100P

Product Options: All

European Office:

Meyer Sound Lab. GmbH

Carl Zeiss Strasse 13

56751 Polch, Germany

Made by Meyer Sound Laboratories

Berkeley, California USA

Introduction

The Integrated Design

TheMeyerUSW-1Pself-poweredsubwooferiscomposedof:

•two15-inchconedrivers.

•phase-corrected,optimizedcontrolelectronics;

•atwo-channelamplifier(550wattstotal).

Thedrivers,controlelectronics,andamplifierareintegrated

intoacompactenclosure.TheUSW-1PpairedwiththeUPA-P

Seriesisideallysuitedforcompact,high-poweredPAapplica-

tions,suchasmainPA,churches,5.1systems,andtheatres.

TheUSW-1PismorethanapoweredversionoftheMeyer

USW-1,ThepoweredUSW-1Pimplementsthesesignificant

designimprovements:

• Thegainstructurebetweenthecontrolelectronicsand

amplifierisperfectlymatched.

• Theamplifierisoptimizedforthesystem,providingsub-

stantialpowerwithoutendangeringthedrivers.

• Theintegrateddesignsimplifiessetupandinstalla-

tion,eliminatesampracks,andextendsthedurability

andreliabilityoftheloudspeaker.

AC Power

The USW-1P uses a PowerCon locking 3-pole AC mains

connectorthatpreventsinadvertentdisconnection. Theunit

musthavethecorrectpowerplugfortheACpowerinthearea

inwhichitwillbeused.

Engagement

Separation

WhenACpowerisappliedtotheUSW-1P,anIntelligentAC

supplyautomaticallyselectsthecorrectoperatingvoltage,al-

lowingtheUSW-1Ptobeusedinternationallywithoutmanu-

allysettingvoltageswitches.TheIntelligentACsupplyper-

formsthefollowingprotectivefunctionstocompensatefor

hostileconditionsontheACmains:

•suppresseshighvoltagetransientsuptoseveralkilo-

volts

• filtersEMI(radiofrequenciesandnoisepresentonthe

ACline)

• sustainsoperationduringlow-voltageperiods,which

minimizesaudiodiscontinuity

• providessoft-startpower-up,whicheliminateshigh

inrushcurrent

TheUSW-1Pcanwithstandcontinuousvoltagesupto264V

andallowsanycombinationofvoltagetoGND(i.e.Neutral-

Hot-GND,Hot-Hot-GND).Continuousvoltageshigherthan

264Vmaydamagetheunit.

Voltage Requirements

TheUSW-1Poperatessafelyandwithoutaudiodiscontinuity

iftheACvoltagestayswithintherange88–264V,47–63Hz.

AfterapplyingACpower,thesystemismutedwhilethecir-

cuitrychargesupandstabilizes.Aftertwoseconds,theOn/

Temp.LEDontheuserpanelilluminatesgreen,thesystem

unmutesandisreadytopassaudiosignals. IftheOn/Temp.

LEDdoesnotilluminateorthesystemdoesnotrespondto

audioinputaftertenseconds,consulttheTroubleshooting

section.

TheUSW-1P’spowersupplyusesstoredenergytocontinue

functioning for about 10 AC cycles if the voltage decreases

below 88V (a condition known as brownout). The precise

lengthoftimetheunitfunctionsduringbrownoutdepends

ontheoperatinglevelandhowlowthevoltagedrops.Theunit

turnsoffifthevoltagedoesnotincreaseabove88Vfor1to

5seconds. IftheUSW-1Pshutsdownduetobrownout,the

powersupplyautomaticallyturnson ifthevoltagereturnsto

thenormaloperatingrange.IftheUSW-1Pdoesnotturnback

onaftertenseconds,consulttheTroubleshooting section.

NOTE: We recommend that the supply be operated at

least a few volts away from the upper and lower

bounds of the operating range to avoid possible

shutdown.

Current Requirements

EachUSW-1Prequiresapproximately3Arms@115V(1.5

Arms@230V)forproperoperation,allowinguptofiveUSW-

1Ptobepoweredfromone15Acircuit.However,werecom-

mendpoweringnomorethanthree USW-1Psper15Abranch

to allow a 30% margin for peak voltages. The USW-1P

presentsadynamicloadtotheACmainswhichcausesthe

amountofcurrenttofluctuatebetweenquietandloudoperat-

inglevels.ThisaffectsthenumberofUSW-1Psthatcanbe

usedforagivenbreakertype.Sincedifferenttypesofcables

andcircuitbreakersheatupandtripatvaryingrates,itis

essentialtounderstandthetypesofcurrentratingsandhow

theycorrespond to circuit breakerand cable specifica-

tions.

ThemaximumcontinuousRMScurrentisthemaximum

RMScurrentoveradurationofatleast10seconds.Itisused

tocalculatethetemperatureincreaseincables,whichisused

toselectcablesthatconformtoelectricalcodestandards.Itis

alsousedtoselecttheratingforslow-reactingthermalbreak-

ers.

ThemaximumburstRMScurrentisthemaximumRMS

currentoveraonesecondduration.Itisusedtoselectthe

ratingformostmagneticbreakers.

Themaximuminstantaneouspeakcurrentduringburstis

usedtoselecttheratingforfast-reactingmagneticbreakers

and to calculate the peak voltage drop in long AC cables

accordingtotheformula

Vpkdrop = Ipk x Rtotal cable

Usethetable below as aguidetoselectcables and circuit

breakerswithappropriateratingsforyouroperatingvoltage

USW-1P Current Ratings

V511V032V001

SMReldIA52.0A31.0A3.0

S2.8A 1.4A 3.2AMRsuounitnoC.xaM

SMRtsruB.xMa3.2A 1.6A 3.7A

tsruBgnirudkaePxMa5.0A 2.5A 5.8A

Todeterminetheminimumtotalservicepowerrequiredbya

systemofUSW-1Ps,orotherMeyerself-poweredspeakers,

addtheirmaximumcontinuousRMScurrentstogether.We

recommendallowinganadditional30%abovetheminimum

amperagetopreventpeakvoltagedropsattheserviceentry

andnuisancetripping.

Power Connector Wiring

UsethefollowingACcablewiringdiagramtocreateinterna-

tionalorspecial-purposepowerconnectors:

AC cable color code

Ifthecolorsreferredtointhediagramdon'tcorrespondtothe

terminalsinyourplug,usethefollowingguidelines:

• Connectthebluewiretotheterminalmarkedwithan

Norcoloredblack.

• Connectthebrownwiretotheterminalmarkedwithan

Lorcoloredred.

• Connect the green and yellow wire to the terminal

markedwithanE(or )orcoloredgreen(orgreenand

yellow).

Safety Issues

Do not use a ground-lifting adapter or cut the AC

cable ground pin.

Keep all liquids away from the USW-1 to avoid

hazards from electrical shock.

Do not operate the unit with worn or frayed cables;

replace them immediately.

If the USW-1 will be installed outdoors, contact

Meyer Sound for information about the optional rain

hood which protects the amplifier and heat sink from

rain. Weather protection for the drivers is also avail-

able.

The Modular Rear Panel

Therearpanelofthe USW-1P hastwoslotsformodules.

ThetopslotcontainstheAudioInputModule;thebottom

slot contains the optional Remote Monitoring System™

(RMS) Module. A blank plate covers the bottom slot if

RMSisnotinstalled.

udio Input

There are three, interchangeable Audio Input Modules

with optimized connectors and controls for different app-

lications.Eachmodulehasa24VFanconnectortopoweran

optionalfan(seefansectiononpage6).

Each module uses a three-pin, female XLR audio input

connectorwitha10kΩbalancedinputimpedancewiredwith

thefollowingconvention:

Pin1 — 220kΩtochassisandearthground(ESDclamped)

Pin2 —Signal+

Pin3 —Signal-

Case — Earth(AC)groundandchassis

Pins 2 and 3 carry the input as a differential signal. Use

standardaudiocables withXLRconnectorsforbalanced

signalsources.AsingleaudiosourcecandrivemultipleUSW-

1Pswithaparalleledinputloop,creatinganunbufferedhard-

wiredloopconnection,withnegligiblelossinsignallevel.

Forexample,sincetheinputimpedanceofoneUSW-1Pis10

kΩ,looping20USW-1Pproducesabalancedinputimped-

ance of 500Ω. With a 150Ωaudio source, the 500Ωload

resultsinonlya2.28dBloss.

For drawings of the modules refer to page 12.

Looping Audio Input Module

Thisstandardmoduleusesabalanced,femaleXLRconnector

foraudioinputandamaleXLRloopconnectortointerconnect

multiplespeakers.Theaudioinputconnectorishardwired

withpin2hottocomplywithaudioindustrystandards.The

loopconnector,wiredinparalleltotheaudioinput,transmits

the input signal even if the USW-1P is turned off for any

reason.

Summing Audio Input Module

ThismodulehastwobalancedfemaleXLRconnectors.The

secondfemaleXLRconnectorfunctionsasasumminginput.

Applyingasignal tooneoftheinputsresultsinanormal

signallevel.Utilizingbothsumminginputscreatesacor-

rectlysummedmonosignalwitheachinput6dBbelowthe

levelofasingleinput.Thisisaneffectivemethodfordistrib-

utingbothsidesofastereosignaltoasingleUSW-1Pwithout

requiringexternallevelcontrol.

Looping, Polarity, and Attenuating Audio

Input Module

Thismodulehasabalanced,femaleXLRaudioinputconnec-

tor,amaleXLRloopconnector,aninputpolarityswitch,and

alevelattenuatorknob.Theinputpolarityswitchoffersa

convenientmethodofreversingthepolarityofthespeaker.

Whentheinputpolarityswitchisintheup(+)position,pin

2ishotrelativetopin3,resultinginapositivepressurewave

whenapositivesignalisappliedtopin2.Whentheswitchis

down(-),pin3ishotrelativetopin2,resultinginapositive

pressurewavewhenapositivesignalisappliedtopin3.The

levelattenuatorknoboperatesbetween0dB(nolevelat-

tenuation)inafullyclockwisepositionto–12dBinafully

counterclockwiseposition.

Remote Monitoring System

TheUSW-1PcanbeequippedtooperatewiththeRemote

MonitoringSystem(RMS)networkandsoftwareapplica-

tion.RMSdisplayssignalandpowerlevels,driverstatus.

limiter activity, the state of the polarity switch, attenuator

level, and amplifier temperature for all speakers in the

networkonaWindows-basedPC.RMScanalsobeconfig-

uredtoenablespeakermuting.RMSisanexcellentfield-

diagnostictoolthatremovestheguessworkfromtrouble-

shootingduringaperformance.AllMeyerSpeakerswith

RMScanbeintegratedonthesamenetwork.Installingan

RMSmodulerequiresonlyaPhillipsscrewdriver.Contact

MeyerSoundformoreinformationaboutRMS.

Amplification, Limiting, and

Cooling System

mplification and Limiting

EachdriverintheUSW-1Pispoweredbyonechannelofa

proprietaryMeyerSoundamplifierutilizingcomplementary

powerMOSFEToutputstages(classAB,bridged).TheUSW-1P

employs two separate methods of limiting: Excursion

Limiting which protects the drivers from over excursion

andSubChannelLimitingwhichpreventsthedriversfrom

damageduetothermaloverload.

LimiteractivityfortheExcursionandSubchannelisindi-

catedbytwoyellowLimitLEDsontherearpanel(theEXC.

Limit LED is above the SUB limit LED). See page 12 for a

diagramoftheuserpanel.

TheUSW-1Pperformswithinitsacousticalspecifications

andoperatesatanormaltemperatureifthelimitLEDsareon

fornolongerthantwoseconds,andoffforatleastonesecond.

DifferentialInputs

IfeitherLEDremainsonforlongerthanthreeseconds,that

channelincurstheseconsequences:

• Increasingtheinputlevelwillnotincreasethevolume.

• Thesystemdistortsduetoclippingandnonlinear

driveroperation.

WhiletheUSW-1Plimitersfullyprotectthesystemunder

overloadconditionsandexhibitsmoothsoniccharacteris-

tics;werecommendthatyoudonotintentionallydrivethe

USW-1Pintocontinuouslimitingtoattaincompressionef-

fects.

Forapplicationswherelargeamountsofcompressionare

required,werecommendusinganoutboardcompressor/lim-

iterforgreatercontroloflimitandcompressoreffects.

Amplifier Natural Convection Cooling System

TheUSW-1P’samplifieremploysanaturalconvectioncool-

ing system that is cooled by the air flowing over the

heatsink.Allowforproperventilationoffreshairwhen

usingthespeakerintightlypackedconditions.

Ifthetemperatureoftheheatsinkreaches85°C(185°F),the

On/Temp.LEDontherearpanelturnsfromgreen(On)tored

(Temp.)andthelimiterthresholdisloweredtoasafelevelto

preventthesystemfromoverheating.Underhightemperature

conditionstheoutputlevelisreduced6dB.Whentheheatsink

temperaturedecreasesto75°C(167°F),theOn/Temp.LED

changesfromredtogreenandthelimiterthresholdreturnsto

normal.

The heatsink reaches temperatures up to 185°F

(85°C) during normal operation. Use extreme

caution when approaching the rear of the cabinet.

Fan ssembly Kit

Whileconvectioncoolingisadequateformostapplications,

USW-1Pswhendrivenintocontinuouslimitingundersevere

temperatureconditions,orwhereventilationisrestricted,

maybenefitfromtheoptionalfankitwhichincreasesairflow

tomaintainasafeoperatingtemperature.

Theeasy-to-installfan,poweredbythe24VFanrearpanel

connector,blowsairdirectlyontotheheatsink.Thefanspeed

increasesastheheatsinktemperaturerises,whichmaintainsa

safeoperatingtemperaturewithminimalfannoise.Contact

MeyerSoundtoorderthefankit.

Power Supply Fan

Thepowersupplyiscooledbyasinglesmallinternalfanthat

turnsonlowwhentheunitisfirstpoweredup.Thefandoubles

itsspeedasthesystemisdrivenwithaudio.Sincethefan

drawsairinfrom,andexhaustsitoutthebackofthecabinet,

theremustbeatleastsixinchesclearancebehindthecabinet,

andadequateairflow.

Rigging

TheUSW-1Pweighs137lb(62kg).Themaximumrecom-

mendedloadforanUSW-1Pwithaircraftpanfittingsis420

lb(191 kg).Thisworkingloadisbasedona5:1safetyfactor.

TheUSW-1Phasthreeriggingplatesontop;eachplateis

capableofsupportingthefullworkingloadofthecabinet.

There are four types of interchangeable rigging plates, each

fastenedbysixPhillipsscrews:

• aircraftpanfittings(ringandstud)

•3/8”-16nutplates

• M-10x1.5metricnutplates

• blankplates(ifnoriggingbracketsarerequested)

NOTE: Units with nut plates are rated for the weight of

one cabinet only.

Riggingloadratingsassumeastraighttensilepullandthatthe

cabinetisinnewconditionwithaircraftpanfittings.Ifthese

conditionsarenotmet,theloadratingscanbereducedsignifi-

cantly.Loadratingscanalsobereducedbyage,wear,and

damage.Itisimportanttoinspecttherigginghardwareregu-

larlyandreplacewornordamagedcomponentsimmediately.

NOTE: All Meyer Sound products must be used in

accordance with local, state, federal, and industry

regulations. It is the owners and/or users responsibility

to evaluate the reliability of any rigging method for

their application. Rigging should be done only by

experienced professionals.

Full Range Systems

Introductory Concepts

The USW-1P is used to add low frequency SPL to sound

systems.ItisoptimizedtobeusedwiththeMeyerUPA-P

seriesself-poweredloudspeakers.Itcanalsobeusedwith

allMeyerSoundloudspeakers.Forinformationonintegrat-

ing the USW-1P with the UPA-P, see the UPA-P Series

OperatingInstructions.ForinformationonusingtheUSW-1P

withotherMeyerSoundproductspleasecontactMeyerSound

TechnicalSupport.

UsingtheUSW-1Pinafull-rangesystemisstraightforwardbut

thefollowingconceptsareimportanttoconsiderbeforein-

stallingasystem.

Room Loading

TheplacementoftheUSW-1Pinaroomoraspaceiscritically

importanttotheresponseofthespeakersystem.AUSW-1P

hungintheairwithnoboundaryconditionswouldnotaddany

SPLfromroomloading.

AUSW-1Pplacedonafloor(half-spaceloading)willgain

approximately6dBcomparedtoitsfreefieldresponse.

6 dB low frequency gain compared to free field.

AUSW-1Pplacedonafloorandagainstawall(quarter-space

loading)willgainapproximately12dBcomparedtoitsfree

fieldresponse.

12 dB low frequency gain compared to free field.

AUSW-1Pplacedonthefloorinacorner(one-eighthspace

loading)willgainapproximately18dBcomparedtoitsfree

fieldresponse.

18 dB low frequency gain compared to free field.

-8

-6

-4

-2

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5

Distance in meters between wall and acoustical center of speaker.

dB SPL relative to free-space response.

SPL vs. Distance to Boundary

Aswehaveseenonthepreviouspage,theplacementofa

USW-1Ponafloororagainstaboundarysignificantlychanges

thelowfrequencyresponse when compared to freefield

measurementofthesamespeaker.

ThegraphbelowrepresentsthechangeindBSPLforfrequen-

ciesunder125HzofasingleUSW-1Pasitismovedaway

fromaboundary.Distancemeasuredinmeters,isbasedonthe

distancefromthewallbehindthespeakertotheacoustical

centeroftheUSW-1P.AlldBSPLmeasurementsaremade

withthemicrophoneonaxistothespeaker.

Tobetterunderstandthegraphabove,imagineaUSW-1P

withawallbehindit.AsyoumovetheUSW-1Pawayfrom

the wall the graph above shows how the response of the

speakerwillchange.ForexampleiftheUSW-1Pisplaced1

meterfromawallandismeasuredonaxistothespeaker,you

willseea-5dBchangeinthelowfrequencyasillustratedby

thedottedlinesonthegraph.

Polarity

WiththeUSW-1Pinclose-proximityto,andcoplanarwith,

theUPA-P,orotherMeyerSpeakers,bothspeakersshouldbe

settothesame polarity.Separatingthesubwoofersandmain

cabinetsinaspeakersystembymorethan5feetmayrequire

polarityreversaloradelaylinetocompensateforthepropa-

gationdelaybetweenthespeakersandthemeasurementposi-

tion.

Measurement and Corre tion Tools

Itisrecommendedthateventhemostcarefullyassembled

soundsystemsbeanalyzedwithprecisemeasurementtools.

Werecommendusing the Meyer SIM®Sound Analyzer

andCP-10ParametricEqualizerto

• choose,place,andarrayspeakers;

• measurepropagationdelaysbetweenspeakerstoset

thecorrectpolarityanddelaytimes;

• measureandequalizevariationsinfrequencyre-

sponsecausedbytheacousticalenvironmentandthe

placementandinteractionofspeakers.

The VX-1:

TheVX-1isanidealcontroloptionforUSW-1Psystems.The

VX-1isastereovirtualcrossoverwhichallowstheuserto

adjustthegain,switchbetweenstereoandmonodistribution

oftwoinputsandmakeshelvingEQadjustmentstotheleft

andrightsidesofthesystem.

USW-1P with the UP -P

TheUSW-1PandUPA-Pcanbeconfiguredinawidevariety

ofarrayconfigurationstosuitspecificapplicationneeds.

RefertotheUPA-POperatingInstructionsforrecommended

arrays;orforadditionalsystemdesignideas,contactMeyer

SoundforthefollowingTechNotesdocumentsonUPA-P

arraydesign:

• TwoUPA-1Ps@70°HorizontalSplay

(Doc #: 01.990.101.90 A)

• TwoUPA-1Ps@85°HorizontalSplay

(Doc #: 01.990.101.91 A)

• TwoUPA-2PsTight-pack(Doc#:01.990.101.92A).

• ThreeUPA-2PsTight-pack(Doc#:01.990.101.93A).

These documents are also available on the Meyer Sound

website:http://www.meyersound.com.

Distance to Boundary vs. dB SPL below 125 Hz

Verifying Driver Polarity

Incorrectdriverpolarityimpairssystemperformanceand

maydamagethedrivers.AllMeyerloudspeakersareshipped

withthedriversincorrectalignment.

Polarity In djacent Loudspeakers

Usethefollowingtestproceduretoverifythepolaritybe-

tweentwoUSW-1P.

1. EstablishareferenceUSW-1P,aspeakerthathasnot

beentamperedwithordamaged.Markthisspeakeras

thereference.

2. PlacetheUSW-1Pyouwanttotestnexttothereference

USW-1P.

3. Placeameasurementmicrophone3feetfromthespeak-

ersontheaxisbetweenthespeakers.Seedrawingat

bottomofpage.

4. Connectasignalsourcetoreferencespeakerandnote

thefrequencyresponseandoveralllevel.

5. ApplythesamesignaltotheUSW-1Pundertestwith

thefirstspeakerstillconnected.

Thepolarity is correctif the frequencyresponse remains

constantwitha5to6dBSPLincreaseinamplitude.Broad-

bandcancellation(decreasedoveralllevel)indicatespolarity

reversal between cabinets. A 2 to 3 dB SPL increase may

indicatethatoneofthedriversintheUSW-1Pundertestisout

ofphase,inthiscase,proceedtothenextsection.

Since polarity reversal causes excessive driver

excursion at high source levels, use moderate

levels when conducting these tests.

Polarity within a USW-1P

Ifthedriverorcircuitwiringhasbeenremovedordisas-

sembleditisessentialtocheckthepolaritybetweendrivers

andbetweenadjacentloudspeakers.

Usethefollowingtestproceduretoverifypolaritybetween

driversinthesameloudspeaker:

1. PlacethereferenceUSW-1PandtheUSW-1P under

testsidetosidesothatthedriversarefacingthesame

direction.

2. Place a measurement microphone 3 feet from the

speakersontheaxisbetweenthespeakers.Seedraw-

ingatbottomofpage.

3. ConnectafullrangesignaltothereferenceUSW-1P

loudspeakerandnotethefrequencyresponseand

soundpressurelevel.

4. ComparethereferenceandtestUSW-1Presults

oneatatime.Asignificantdecreaseinenergyfrom

40to100HzintheUSW-1Pundertestindicatesa

driverreversal.ContactMeyerSoundTechnical

SupportforinformationonServiceCenterorfield

correction.

5. IfthereferenceandUSW-1Pundertesthavesimilar

responses,thenthereisnointernalpolarityerrorwithin

theloudspeaker.

3 feet

Reference

USW-1P

Front of Speaker

Microphone

USW-1P

under test

Troubleshooting

Thissectionsuggestsseveralpossiblesolutionstosomecom-

mon problems encountered by USW-1P users and is not

intendedtobeathoroughtroubleshootingguide.Contact

MeyerSoundforadditionalinformationanddocumentation.

The On/Temp. LED does not illuminate, there

is no audio, and the power supply fan is

off.

1. MakesuretheACpowercableisthecorrecttypeforthe

regionalvoltageandthatitissecurelyconnectedtothe

ACinletthenunplugandreconnecttheACcable.

2. UseanACvoltmetertoverifythattheACvoltageis

withintheranges88–264V,47–63Hz.

3. CallMeyerSoundTechnicalSupport.

The On/Temp. LED is illuminated but there is

no sound.

1. Verifythattheaudiosource(mixer,EQ,delay)issend-

ingavalidsignal.

2. Make sure the XLR cableis securelyfastened to the

XLRaudioinputconnector.

3. VerifythattheXLRcableisfunctioningbysubstituting

another cable or by using the cable in question in a

workingsystem.

4. Sendtheaudiosignaltoanotherspeakertoinsuresignal

presenceandthattheleveliswithintheproperrange.

Turnthesourceleveldownbeforereconnectingthe

audioinputandincreasethelevelslowlytoavoida

suddenblastofsound.

5. Ifpossible,monitortheaudiosourcewithheadphones.

Hum or noise is produ ed by the speaker.

1. Disconnecttheaudioinput.Ifthenoisepersists, the

problemiswithintheUSW-1P.Inthiscasereturnthe

unittothefactoryornearestauthorizedservicecenter.If

thehumceases,thenoiseoriginatessomewhereearlier

inthesignalpath.

2. Make sure the XLR cableis securelyfastened to the

XLRaudioinputconnector.

3. Sendtheaudiosignaltoanotherspeakertoinsuresignal

presenceandthattheleveliswithintheproperrange.

Turnthesourceleveldownbeforereconnectingthe

audioinputandincreasethelevelslowlytoavoida

suddenblastofsound.

5. Humornoisecanbeproducedbyagroundloop.Since

theUSW-1Piseffectivelyground-lifted,theloopmust

bebrokenelsewhereinthesystem.

The audio produ ed by the speaker is dis-

torted or ompressed but the limit light is

not illuminated.

1. Make sure the XLR cableis securelyfastened to the

XLRaudioinputconnector.

2. Sendtheaudiosignaltoanotherspeakertoinsurethat

theleveliswithintheproperrange.Turnthesourcelevel

downbeforereconnectingtheaudioinputandincrease

thelevelslowlytoavoidasuddenblastofsound.

3. Monitortheaudiosourcewithheadphones.

The audio produ ed by the speaker is highly

ompressed and the limit light is onstantly

red.

1. Turndowntheleveloftheinputsignaltothespeaker

system.

There is sound but it is does not seem to

be at full power and the On/Temp. LED is

yellow.

Thisoccursinconditionswheretheheatsinktemperature

reaches85°C(185°F),indicatingthattheamplifieristher-

mallyoverloaded.Thelimiterthresholdhasdroppedtoasafe

level,sotheaudiolevelisreduced.

1. Makesurethereisenoughclearanceabove,below,and

behindtheunit.

2. Makesurethereissufficientairflowaroundtheunit.

3. Avoidexposingtheheatsinktodirectsunlightifthe

ambienttemperatureishigh.

4. Iftheambienttemperatureisgreaterthan30°Candthis

conditionoccursfrequently,contactMeyerSoundto

ordertheoptionalFanKit.

See the section Amplification, Limiting, and Cooling

System on page 6 for a complete discussion about the

coolingsystem.

There is no sound, the On/Temp. LED is

dim or off, and the power supply fan is on

high speed.

Thisextremelyrareeventoccurswhenthepowersupplyover-

heats,causinga1-2minuteinterruptioninoperation.Theunit

turnsonagainwhenthepowersupplyhascooledsufficiently.

1. Makesurethereisatleastsixinchesclearancebehind

theunit.

2. Makesurethereissufficientairflowaroundtheunit.

See the section Amplification, Limiting, and Cooling

System onpage6foramoreinformationaboutthepower

supply’sinternalfanandcoolingsystem.

Altri manuali per USW-1P

Indice

Altri manuali Meyer Sound Subwoofer

Meyer Sound

Meyer Sound UMS-1P Manuale utente

Meyer Sound

Meyer Sound 650-R2 Manuale utente

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Meyer Sound UMS-SM Manuale utente

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Meyer Sound Reinforcement Subwoofer 650-R2 Manuale utente

Meyer Sound

Meyer Sound PSW-4 Manuale utente

Meyer Sound

Meyer Sound UltraSeries Subwoofer USW-1 Manuale utente

Meyer Sound

Meyer Sound 650-P Manuale utente

Meyer Sound

Meyer Sound UMS-1P Manuale utente

Meyer Sound

Meyer Sound M1D Manuale utente

Meyer Sound

Meyer Sound 600-HP Manuale utente

Meyer Sound

Meyer Sound M2D-SUB Manuale utente

Meyer Sound

Meyer Sound Amie-Sub Manuale utente

Meyer Sound

Meyer Sound MM-10 Manuale utente

Meyer Sound

Meyer Sound 600-HP Manuale utente

Meyer Sound

Meyer Sound UltraSeries MSW-2 Manuale utente

Meyer Sound

Meyer Sound 700-HP Manuale utente

Meyer Sound

Meyer Sound MSW-2 Manuale utente

Meyer Sound

Meyer Sound PSW-2 Manuale utente

Meyer Sound

Meyer Sound PSW-6 Manuale utente

Meyer Sound

Meyer Sound 650-P Manuale utente

Meyer Sound

Meyer Sound 500-HP Manuale utente

Meyer Sound

Meyer Sound M3D Manuale utente

Meyer Sound

Meyer Sound PSW-6 Manuale utente

Meyer Sound

Meyer Sound USW-1P Manuale utente

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