Parasound Halo A 23 Owner's Manual
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Parasound Halo A 23 Owner's Manual

Parasound owner's guide power amplifier a 23
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Summary of Contents for Parasound Halo A 23

  • Page 1 A 23 Amplifier Owner’s Guide...

  • Page 2: Thank You

    If you’re eager to get up and running right away, simply follow the basic step-by-step instructions to connect and operate the A 23. If you want to learn about some of the technical and design aspects of your A 23, refer to the Technically Speaking and Parasound A 23 Design Overview sections in the back of the manual.

  • Page 3: Table Of Contents

    TO THE BALANCED INPUTS ON THE A 23 _________________________________________________________________________________ CONNECTING A PREAMPLIFIER OR SURROUND CONTROLLER TO THE UNBALANCED INPUTS ON THE A 23 _________________________________________________________________________________ CONNECTING THE LOOP OUT JACKS ON THE A 23 TO ANOTHER POWER AMPLIFIER’S INPUTS _________________________________________________________________________________ CONNECTING SPEAKERS TO THE A 23 _________________________________________________________________________________...

  • Page 4: Placement Guidelines For Your A

    Rack Mounting Your Parasound A 23 If you plan to mount the A 23 into a standard 19” wide equipment rack, you will need to purchase the optional Parasound HRA 2 Rack Mount Adapter. With its four feet removed, the A 23 chassis and front panel height occupies two rack spaces (3-1/2”...

  • Page 5: Connecting A Preamplifier Or Surround Controller To The Balanced Inputs On The A

    Balanced XLR Jacks and Their Pin Configuration The balanced inputs of the A 23 use XLR jacks that conform to the industry standard of: Pin 1: Ground, Pin 2: Positive (+), Pin 3: Negative (--). The balanced outputs on some components use terminals with 3 screws instead of XLR jacks.

  • Page 6: Connecting A Preamplifier Or Surround Controller To The Unbalanced Inputs On The A

    • A source component with RCA output jacks Before Connecting Leave the AC cord on the A 23 disconnected until you have made all other connections to prevent any surprise burst of sound. Make sure that all your cables are long enough so they are not strained or stretched once they are connected.

  • Page 7: Connecting The Loop Out Jacks On The A 23 To Another

    • An additional amplifier Before Connecting Leave the AC cord on the A 23 disconnected from the wall until you have made all of the connections in the system to prevent any surprise burst of sound. Make sure that your interconnect cables are long enough so they are not strained or stretched once they are connected.

  • Page 8: Connecting Speakers To The A 23

    Remove power to all the components in your audio system. To Connect Insert one wire with the ridge or other marking into the red terminal on the A 23. Insert the wire without the ridge or other marking into the black Right (negative) speaker terminal on the A 23.

  • Page 9: Configuring The A 23 For Bridged Mono Operation

    CONFIGURING THE A 23 FOR BRIDGED MONO OPERATION In certain applications, you may require your A 23 to power a single 8 Ω speaker by using its bridged mono feature. In most instances, you won’t use the A 23 this way and you can skip this section.

  • Page 10: Manual And Automatic Turn On-Off Options

    MANUAL AND AUTOMATIC TURN ON-OFF OPTIONS You can manually turn the A 23 on and off with its front panel On-Off button. It can also be triggered to turn on and off automatically when your preamplifier, surround controller, or system controller is turned on and off.

  • Page 11: Connecting An External Dc Source For Automatic On-Off

    CONNECTING AN EXTERNAL DC SOURCE FOR AUTOMATIC ON-OFF If you want to automatically turn on and off the A 23 with an external DC voltage, choose the DC Triggering option by moving the Auto Turn On What You’ll Need: • A cable with a 2.5 mm sub-mini plug on each end (provided) •...

  • Page 12: Connecting The A 23 To Trigger Another Component

    YOU SHOULD KNOW If the device you want to use to control your A 23 doesn’t have a 2.5 mm trigger output connector, you can cut one plug off the cable and terminate the end as required. The lead with the red stripe is positive and the lead without the white stripe is negative.

  • Page 13: Understanding The Indicators On The A 23

    AC Present Indication When the A 23 is plugged into a live AC outlet, a soft blue halo glows behind its and its red “P” Badge glows faintly. These indicate that the unit is plugged into a live AC outlet, even when it is turned off.

  • Page 14: Connecting The Ac Power Cord

    Remove power to all the components in your audio system. To Connect Plug the female end of the AC cord to the AC receptacle on the rear of the A 23. Plug the male end of the AC cord to an AC outlet or power strip.

  • Page 15: Maintaining Your A 23

    MAINTAINING YOUR A 23 Your Parasound A 23 power amplifier requires no periodic maintenance and has no user-serviceable parts inside. To avoid the risk of electric shock, do not remove its top cover. The amplifier’s exterior can easily be cleaned with a soft cloth pre-moistened only with a few drops of water or glass cleaner.

  • Page 16: Troubleshooting Guide

    LEDs not illuminated A 23 has overheated - red Hi Temp Allow A 23 to cool. Check that there is adequate indicator is on ventilation around the A 23. Be sure the load impedance of each channel is no less than 4 Ω...

  • Page 17: Servicing Your A 23

    Procedure for Returning Your A 23 to Parasound for Service If Parasound determines that you should send your A 23 to Parasound, you will be given a Return Authorization (RA) number. This RA number must be clearly marked on the outer carton only.

  • Page 18: Technically Speaking

    50 mV (fully counterclockwise) to a minimum sensitivity of 200 mV (fully clockwise). If you set this control to 50 mV, the A 23 might be falsely triggered on by non-musical or noisy signals that can appear in the system, such as when you switch preamp inputs at high volume levels.
  • Page 19 Parasound rack mount kits. Extras are available from rack manufacturer Middle Atlantic Products, www.middleatlantic.com. 3. Use the Ground Lift switch on the A 23 to eliminate most ground loops. This separates the A 23’s signal input ground from its chassis ground to isolate unwanted voltage in the ground shields of the unbalanced (RCA) interconnect cables.

  • Page 20: Parasound A 23 Design Overview

    I can’t think of any other audio products that offer nearly as much bang for the buck.” Parts Selection Every part within the A 23 is carefully chosen for its accuracy and reliability. Metal film resistors with 1% tolerance are selected for their precision and because their values don’t drift as they heat up during...
  • Page 21 It operates outside the audio signal path to keep the DC offset at the output of the A 23 at a constant 0.00 Vdc. The results are startling clarity, freedom from listening fatigue, and formidable bass response.

  • Page 22: Parasound A 23 Specifications

    Total Height with rack adapter attached: 3-5/8” Depth: 13-3/4” (350 mm) Power Requirement Standby: 25 Watts Full Power into 4 Ω: 700 Watts Net Weight 28 lb.(12.7 kg) Shipping Weight 35 lb.(15.9 kg) © Parasound Products, Inc. 2002. V 1.0...
  • Page 23 Parasound Products, Inc. 950 Battery Street, San Francisco, CA 94111 www.parasound.com 415-397-7100 / Fax 415-397-0144...

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