Table of Contents
Advertisement
Advertisement
Table of Contents
Related Manuals for Parasound Halo A 21
Summary of Contents for Parasound Halo A 21
- Page 1 A 21 Amplifier Owner’s Guide...
- Page 2 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 21. If you want to learn about some of the technical and design aspects of your A 21, refer to the Technically Speaking and Parasound A 21 Design Overview sections in the back of the manual.
-
Page 3: Table Of Contents
CONFIGURING THE A 21 FOR BRIDGED MONO OPERATION _________________________________________________________________________________ MANUAL AND AUTOMATIC TURN ON-OFF OPTIONS _________________________________________________________________________________ CONNECTING AN EXTERNAL DC SOURCE FOR A 21 AUTOMATIC TURN ON-OFF _________________________________________________________________________________ CONNECTING THE A 21 TO TRIGGER ANOTHER COMPONENT _________________________________________________________________________________ UNDERSTANDING THE INDICATORS ON THE A 21... -
Page 4: Placement Guidelines For Your A
• Line up the three holes on each bracket with the three holes on the A 21 and reinsert the screws. • Make sure the screws are tight because they will support the entire weight of the A 21 in the equipment rack... -
Page 5: Connecting A Stereo Preamplifier Or A Surround Controller To The Balanced Inputs On Your A
3 screws instead of XLR jacks. These are compatible with the A 21 as long as you match the bare wires to the corresponding pins on the XLR plug: + to pin 2, - to pin 3, and Ground to pin 1. -
Page 6: Connecting A Stereo Preamplifier Or A Surround Controller To The Unbalanced Inputs On Your A
Make sure that all your cables are long enough so they are not strained or stretched once they are connected. Make sure the Inputs switch on the A 21 is in its Unbalanced (down) position and the Ground switch is in its Normal (down) position. -
Page 7: Connecting The A 21 Loop Out Jacks
• An additional amplifier Before Connecting Leave the AC cord on the A 21 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 Your A 21
To Connect Insert one wire with the ridge or other marking into the red Right + (positive) speaker terminal on the A 21. Insert the wire without the ridge or other marking into the black Right (negative) speaker terminal on the A 21. -
Page 9: Configuring The A 21 For Bridged Mono Operation
CONFIGURING THE A 21 FOR BRIDGED MONO OPERATION In certain applications, you may require your A 21 to power a single 8 Ω speaker by using its bridged mono feature. In most instances, you won’t use the A 21 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 21 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 A 21 Automatic Turn On-Off
Before Connecting Remove Power to all the components in your audio system. Make sure the Auto Turn On switch on the A 21 rear panel is in its 12V (down) position. To Connect Plug one end of the trigger wire into the 12V Input jack on the A 21. -
Page 12: Connecting The A 21 To Trigger Another Component
To Connect Plug one end of the trigger wire into the 12V Output jack on the A 21. Plug the other end of this wire into the component that you want the A 21 to trigger. YOU SHOULD KNOW If the device you want your A 21 to control doesn’t have a 2.5 mm trigger output connector, you can cut one plug off the cable and terminate the end as required. -
Page 13: Understanding The Indicators On The A 21
AC Present Indication & When the A 21 is plugged into a live AC outlet, a soft blue halo glows behind its On-Off button 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 A 21 Ac Power Cord
110 V - 120 V or 220 V - 240 V Operation The A 21 can operate on either 110 V - 120 V or 220 V - 240 V. The correct line (or “AC mains”) voltage for your unit is marked on its carton. Changing the A 21’s operating voltage involves rewiring internal connections for both its main power transformer and standby power transformer, plus changing fuse values. -
Page 15: Maintaining Your A 21
MAINTAINING YOUR A 21 Your Parasound A 21 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 21 has overheated - red Hi Temp Allow A 21 to cool. Check that there is adequate indicator is on ventilation around the A 21. Be sure the load impedance of each channel is no less than 4 Ω... -
Page 17: Servicing Your A 21
Procedure for Returning Your A 21 to Parasound for Service If Parasound determines that you should send your A 21 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
4 Ω load and a 4 Ω speaker appears as only a 2 Ω load. The A 21 is not capable of driving 2 Ω for extended periods because it will draw more current and generate more heat than it can dissipate. We strongly recommend against using speakers rated at less than 8 Ω... - Page 19 Extras are available from rack manufacturer Middle Atlantic Products, www.middleatlantic.com. 3. Use the Ground switch on the A 21 to eliminate most ground loops. This separates the A 21’s signal input ground from its chassis ground to isolate unwanted voltage in the ground shield of the unbalanced (RCA) input cable.
-
Page 20: Parasound A 21 Design Overview
AC power lines from computers and other appliances in the home. Relay-Bypassed Soft Start Circuit When the A 21 is first turned on, there is a significant amount of in-rush current required to charge the enormous power supply capacitors. In order to... - Page 21 It operates outside the audio signal path to keep the DC offset at the output of the A 21 at a constant 0.00 Vdc. The results are startling clarity, freedom from listening fatigue, and formidable bass response.
-
Page 22: Parasound A 21 Specifications
” (485 mm) Power Requirement Standby: 25 Watts Full Power into 4 Net Weight 60 lb. (27.3 kg) Shipping Weight 74 lb. (33.7 kg) Ω V 1.0 © Parasound Products, Inc. 2002. ” (445 mm) ” (194 mm) Ω: 1500 Watts... - Page 23 Parasound Products, Inc. 950 Battery Street, San Francisco, CA 94111 www.parasound.com 415-397-7100 / Fax 415-397-0144...
Need help?
Do you have a question about the Halo A 21 and is the answer not in the manual?
Questions and answers