Parasound A 31 manual Specifications

Page 19

Specifications

Power Output - All Channels Driven

250 watts RMS x 3, continuous,

(20 Hz - 20 kHz, 8Ω)

400 watts RMS x 3, continuous,

(20 Hz - 20 kHz, 4Ω)

Current Capacity:

60 amperes peak per channel

Slew Rate

> 130 volts per microsecond

Frequency Response

5 Hz - 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

Input Sensitivity for 28.28 V Output into 8Ω

Unbalanced: 1 V

Balanced: 1 V per leg

(Gain controls set to Normal / THX)

S/N Ratio

>112 dB, input shorted, IHF A-weighted

>102 dB, input shorted, unweigh

Damping Factor

> 1100 at 20 Hz

DC Trigger Requirements

+9 Vdc to +12 Vdc, 2 mA

Audio Trigger Requirements

2 mV AC - 10 mV AC

XLR Pin Identification

1 = Ground (Shield)

2 = Positive

3 = Negative (Return)

Dimensions

Width: 171⁄2" (445 mm)

Panel height: 7" (178 mm)

Height with feet: 7 5⁄8" (194 mm)

Depth: 19 1/8" (485 mm)

Net Weight

65 lb. (29.5 kg)

Input Impedance

Shipping Weight

Unbalanced: 47k Ω

79 lb. (35.9 kg)

Balanced: 94k Ω per leg

 

 

Power Requirement

 

Standby: 1 Watt

 

Maximum: 1800 Watts

Specifications and features subject to change or improvement without notice.

Copyright Parasound Product Inc., 2012

Rev. 1.0

www.parasound.com

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Contents OWNER’S Guide Important Safety Instructions Table of Contents Thank You for Choosing Parasound Important Warranty informationParasound Staff Keeping Records for Future Reference AC Mains Voltage Unpacking Your a 31 & Placement GuidelinesUnpacking Your a Rack Mounting Your Parasound a Audio Input Connections Audio ConnectionsCorrect Speaker Polarity is Important Speaker Wire Length and Gauge thicknessSpeaker Connections Speaker TerminalsWhen to Set the Gain Control Knobs Above or Below Normal Gain Control Settings12V Position Automatic on/off Turn On OptionsManual Position Audio Position Automatic on/off12V Loop Out Jack AC Power CordVolt Jacks 12V In JackOn-Off Button Front Panel OperationBalanced and Unbalanced Lines Technically SpeakingGround Loops Eliminating Hum and Buzz Circuit Designed by John Curl Bare Speaker Wire EndsPower Supply Parasound a 31 Design OverviewInput Stage Complementary ConfigurationRelay-Bypassed Soft Start Circuit Audio Circuit Path TopologyTotal Protection Relays Output StageClass A-A/B Operation Total Protection DC ServosBackground Hum or Hiss Problems and RemediesUnit will not turn on No sound from speakersAre You Having Difficulty? Repair or ServiceSpecifications Parasound Products, Inc McKinnon Ave, San Francisco, CA