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A 31

Three Channel Amplifier

OWNER’S GUIDE

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Summary of Contents for Halo A 31

Page 1: ...A 31 Three Channel Amplifier OWNER S GUIDE ...

Page 2: ...g This plug will only fit into a grounding power outlet If you are unable to insert the plug into the outlet contact your electrician to replace your obsolete outlet Do not defeat the safety purpose of the grounding plug 11 Power Cord Protection Power supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them 12 Lightning Unplug the un...

Page 3: ... 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 ...

Page 4: ...make an extra copy of your original purchase receipt bill of sale and store it inside the A 31 s carton Parasound A 31 Amplifier Serial ______________ 5 digit number below the bar code Parasound Dealer ___________________________________________________ Parasound Dealer Phone Number ___________________ Date of Purchase ______________________ Important Warranty information There is no Parasound war...

Page 5: ... a 90 right angle Ventilation Requirements Always position the A 31 horizontally The A 31 should never be stacked above another power amplifier Do not install the A 31 in an unventilated equipment cabinet or compartment Pockets of stagnant hot air can build up even in a cabinet with an open front and back A ventilation fan such as the Parasound Zbreeze is highly recommended to prevent hot spots in...

Page 6: ...oles on the A 31 and reinsert the screws Make sure the screws are tight because they will support the entire weight of the A 31 in the equipment rack Note Tighten each bolt just enough to keep the unit secure in the rack to avoid deforming the shoulder washers Eliminating metal to metal contact reduces the likelihood of creating a ground loop that might introduce hum into your system A single stan...

Page 7: ...s in the Technically Speaking section for additional information about why we recommend using balanced lines Unbalanced RCA Input Jacks Use these inputs if your surround sound preamplifier doesn t have balanced output connections or if you simply prefer to use unbalanced connections Balanced Unbalanced Selector Switches Place the switch in the position for the input type you will be using Note The...

Page 8: ...ed to the and terminals at the other end This coding will help you keep the and polarity consistent for all channels If some of the speakers are wired with incorrect polarity you will significantly affect sound quality Speaker Wire Length and Gauge thickness When selecting speaker wire follow these guidelines Keep the length of your speaker wire as short as possible Use the thickest wire practical...

Page 9: ...from the pre out jacks of an AV receiver as opposed to an AV processor We recommend advancing the gain as little as possible past Normal As you increase gain settings you increase the chance of hearing a hiss sound from your speakers You also run the risk of damaging your speakers not to mention your hearing if the volume level is too high The primary reason to reduce the gain below Normal would b...

Page 10: ...gnal level required for the A 31 to automatically turn on when the Turn On switch is set to the Audio position Fully counter clockwise is the most sensitive setting and therefore is labeled Quieter Fully clockwise will require a higher audio signal voltage and is therefore labeled Louder In most systems the best results will be with the Turn On Threshold knob set towards the Quieter position In so...

Page 11: ...ooped 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...

Page 12: ...tions such as excessive heat load impedance that is too low or a short circuited speaker connection or wire After you correct the fault the A 31 will resume operation If the A 31 remains in protection after it has cooled down and you ve confirmed there are no external faults it could indicate an internal problem Please contact Parasound s Technical Service Department Channel Indicators When all th...

Page 13: ...round To send and receive balanced signals requires special differential circuitry A differential input circuit amplifies only the difference between the positive and negative signals For example when a 1 Volt signal arrives at a balanced input stage the differential input sees a positive 1 Volt minus a negative 1 Volt or 2 Volts total External hum and noise that somehow gets into a balanced line ...

Page 14: ...s used in live concerts by The Grateful Dead and the Montreux Jazz Festival in Switzerland As our featured amplifier designer since 1990 he has created many products that have earned Parasound worldwide acclaim John is particularly proud of what he and Parasound have accomplished together The circuits I design for Parasound are extremely sophisticated and are typical of products that are far more ...

Page 15: ...ly chosen discrete transistors that result in superior performance at each stage We use JFETs Junction Field Effect Transistors for the input stage MOSFETs Metal Oxide Field Effect Transistors for the driver stage and bipolar transistors for the output stage Discrete transistors are more sonically accurate than integrated circuits commonly used by other brands Complementary Configuration Each stag...

Page 16: ...d avoid fans whose noise can be heard over the music The A 31 input and driver stages employ pure Class A while its output stage operates with higher pure Class A power than many amplifiers selling for twice or three times its price The result is less fatiguing more natural sound Total Protection DC Servos Direct Current DC burns out speakers Every power amplifier must have some way to insure that...

Page 17: ...h is set to Audio or 12V If using Audio Turn on try increasing the sensitivity of the audio trigger by turning the audio threshold knob to the Quieter position Check that the AC power is live No sound from speakers Check that input cables and speaker wires are secure at both ends Make sure the surround preamp is switched to the correct input Is the Hi Temp light illuminated All three blue channel ...

Page 18: ...asound Under the Following Conditions 1 Unit was sent without the Parasound assigned RA number marked on the carton 2 Unit was sent in an unsuitable shipping carton and packing inserts and is likely to have been damaged in transit 3 Unit has inadequate packing materials and is likely to have been damaged in transit Wrapping the A 31 with bubble wrap will not protect it during shipment 4 Unit was s...

Page 19: ... 79 lb 35 9 kg Power Requirement Standby 1 Watt Maximum 1800 Watts 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 liste...

Page 20: ...20 Parasound Products Inc 2250 McKinnon Ave San Francisco CA 94124 415 397 7100 Fax 415 397 0144 www parasound com ...

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