Parasound A 31 User manual

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A31ThreeChannelPowerAmplifier
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SurroundSoundFlexibilitywithAward‐WinningPerformance
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TheA31wasdesignedinresponsetoincreasingdemandforathreechannelpowerampthatholds
nothingbackinpowerorperformance.TheA31isidenticalinperformanceandsoundtotheaward‐
winningHaloA51.HereareafewofthemanyapplicationsfortheA31:
1) Topowerthefrontthreechannelsofahometheater.Thesurroundorbackchannelscanthenbe
poweredbyasmaller2chParasoundpowerampsuchastheHaloA23.Thisgivesthegreatest
powertothefrontchannelswhereitisneededthemost.
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2) Topowerthecenterchannelandtwosurroundchannels.ThisallowstheLeftandRightfront
speakerstobepoweredbyadedicatedtwochannelpowerampsuchastheHaloA21,orbetter
yet,twoJC1monoblocks.Thisisidealforthemusicloverwhoisunwillingtocompromisestereo
reproduction.
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3) TopowerthefrontthreechannelsinanAVreceiver‐basedsystem.Theremainingsurroundand
backchannelscanbedrivenbythereceiver.Thisassuresyouthebestsoundforthefrontchannels
whileenablingtheAVRtoproducemorepowerforthesurroundandbackchannels.
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HoweveryouemploytheA31,youwillbedelightedbyitsimpeccablesonics,strikingauthorityand
faithfulreproductionofthesmallestdetails.
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Input Sensitivity for 28.28 V Output into 8 Ω
Unbalanced: 1 V
Balanced: 1 V per leg
S/N Ratio
> 112 dB, input shorted, IHF A-weighted
> 102 dB, input shorted, unweighted
Damping Factor: > 1100 at 20 Hz
Dimensions
Width: 17 1⁄2" (445 mm)
Panel height: 7" (178 mm)
Height with feet: 7 5⁄8" (194 mm)
Depth: 19 1/8" (485 mm)
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Net Weight: 65 lbs (29.5 kg)
Shipping Weight: 79 lbs (35.9 kg)
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Power Requirement
Standby: < 1 Watt
Maximum: 1500 Watts
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Features
‐Gaincanbeadjustedupto6dBaboveTHX®gain
‐HighbiasclassA/ABoperation
‐CircuitrydesignedbylegendaryJohnCurl
‐Directcoupled(nocapacitorsorinductorsinthesignalpath)
‐ComplementaryJFETinputstage,MOSFETdriverstage&bipolaroutputstage
‐UnbalancedRCAandbalancedXLRinputs(maybemixed)
‐THXUltra2®certified
‐Autoturn‐onby12vtriggeroraudiosignal
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Specifications
Power Output - All Channels Driven
250 watts RMS x 3, 20 Hz - 20 kHz, 8Ω
400 watts RMS x 3, 20 Hz - 20 kHz, 4Ω
Current Capacity: 60 amperes peak per ch.
Slew Rate: > 130 volts per microsecond
Frequency Response
5Hz -100 kHz, +0/-3 dB at 1 watt
Total Harmonic Distortion
< 0.2 % at full power
< 0.03 % at typical listening levels
IM Distortion: < 0.04 %
TIM: Unmeasurable
Dynamic Headroom: > 1.5 dB
Interchannel Crosstalk
> 78 dB at 1 kHz
> 63 dB at 20 kHz
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Parasound Products, Inc., 2250 McKinnon Ave., San Francisco, CA 94124 / 415 397-7100
Formorephotos,features,specificationsandproductmanuals,visitusatwww.parasound.com