Parasound A 31 manual Volt Jacks, AC Power Cord, 12V In Jack, 12V Loop Out Jack, 5mm vs .5mm jacks

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12 Volt Jacks

12V In Jack

The A 31 12V input uses a 3.5mm jack (mono). To use the 12V trigger, insert the trigger wire plug into this jack and the plug at the wire’s other end into the AV receiver or preamp’s 12V output jack. We have included a 3.5mm to 3.5mm trigger wire as well as a 3.5mm to 2.5mm trigger wire.

Note: If the controller’s trigger output is a + and – terminal, you can cut the 3.5mm plug off one end of the included trigger wire and attach the bare wires to these terminals. The lead with the white stripe on it corresponds to the plug’s tip and the unmarked lead corresponds to the sleeve of the plug. The trigger plug tip is + (positive) and its sleeve – (negative).

Note: The A 31 trigger circuit draws a negligible 15 mA. The total load on your preamp’s trigger output(s) is the sum of the trigger current drawn by each of the components you’ve looped together. Check the maximum capacity of your AV receiver, processor or home controller’s trigger outputs so you do not overload them by connecting too many power amplifiers. Typical ratings are 50mA to 100mA.

12V Loop Out Jack

The Trigger Out jack lets you loop or “daisy-chain” the incoming trigger voltage to an additional A 31 or another component(s).

3.5mm vs. 2.5mm jacks

Some other Parasound power amplifiers and preamplifiers might use 2.5mm “sub-mini” trigger jacks. To use the A 31 with products that use a 2.5mm jack we have included a trigger wire with a 3.5mm plug at one end and a 2.5mm plug at the other end.

AC Power Cord

The IEC standard AC cord supplied with your A 31 is an audiophile-grade component. Please connect it directly to an AC wall outlet or power conditioner that is always “live.” If possible, plug your A 31 into the same AC outlet that your preamplifier is plugged into. If different AC outlets are used for the A 31 and the preamplifier the ground potential may be higher or lower between the outlets, resulting in audible hum.

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Contents OWNER’S Guide Important Safety Instructions Table of Contents Parasound Staff Keeping Records for Future Reference Important Warranty informationThank You for Choosing Parasound Unpacking Your a Unpacking Your a 31 & Placement GuidelinesAC Mains Voltage 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 OperationGround Loops Eliminating Hum and Buzz Technically SpeakingBalanced and Unbalanced Lines 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
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