Parasound A 31 manual Table of Contents

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Table of Contents

Introduction	4
Placement and Ventilation Guidelines	5
AC Mains Voltage	5
Rack Mounting	6
Audio Input and Output Connections	7
Gain Control Settings	9
Turn On Options	10
Front Panel Operation	12
Technically Speaking	13
Design Overview	14
Problems and Remedies	17
If You Require Assistance or Warranty Repair	18
Specifications	19

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Contents OWNER’S Guide Important Safety Instructions Table of Contents Important Warranty information Thank You for Choosing ParasoundParasound Staff Keeping Records for Future Reference Unpacking Your a 31 & Placement Guidelines AC Mains VoltageUnpacking 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 OperationTechnically Speaking Balanced and Unbalanced LinesGround 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