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Related Manuals for Parasound Halo A 51
Summary of Contents for Parasound Halo A 51
- Page 1 A 51 Amplifier Owner’ s Guide...
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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 51. If you want to learn about some of the techni- cal and design aspects of your A 51, refer to the Technically Speaking and Parasound A 51 Design Overview sections in the back of the manual. -
Page 3: Table Of Contents
A 51 Amplifier PLACEMENT GUIDELINES FOR YOUR A 51 CONNECTING A SURROUND CONTROLLER TO THE BALANCED INPUTS ON YOUR A 51 CONNECTING A SURROUND CONTROLLER TO THE UNBALANCED INPUTS ON YOUR A 51 CONNECTING YOUR SPEAKERS TO THE A 51... -
Page 4: Placement Guidelines For Your A
• front panel and in front of its first heatsink fin. Line up the three holes on each bracket with the three holes on the A 51 and reinsert the screws. • Make sure the screws are tight because they will support the entire weight of the A 51 in the •... -
Page 5: Connecting A Surround Controller
Make sure that all your cables are long enough so they are not strained or stretched once they are connected. Make sure the Balanced - Unbalanced Input Select switch on the rear of the A 51 is in its Balanced (left) position and the Ground switch is in its Normal (down) position. -
Page 6: Connecting A Surround Controller
Ground switch is in its Normal (down) position. To Connect 1 Plug one end of the cable into the Unbalanced Ch 1 Input jack on the A 51. 2 Plug the other end of the cable into the unbalanced output jack for the channel on your surround controller that you wish to correspond to Ch 1 on your A 51. -
Page 7: Connecting Your Speakers To The A 51
CONNECTING YOUR SPEAKERS TO THE A 51 Speaker Terminals The A 51 speaker terminals accept speaker wires with banana plugs or bare ends. Refer to Bare Wire Speaker Termination in the Technically Speaking section for information about bare wire termination. -
Page 8: Manual And Automatic Turn On-Off Options
Manual On-Off from the Front Panel If you want to manually turn on and off the A 51 at any time, you need to first select the Manual On- Off option by placing the Auto Turn On switch (on the rear panel) to its middle Man (Manual) position. -
Page 9: Connecting An External Dc Source For Automatic On-Off
Auto Turn On Switch, set to down position YOU SHOULD KNOW If the device you want to use to control your A 51 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 stripe is negative. -
Page 10: Understanding The Indicators On The A
AC Present Indication When the A 51 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 11: Connecting The Ac Power Cord
110 V - 120 V or 220 V - 240 V Operation The A 51 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 51’s operating voltage involves rewiring internal connections for both its main power transformer and standby power trans- former, plus changing fuse values. -
Page 12: Maintaining Your A
MAINTAINING YOUR A 51 Your Parasound A 51 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 13: Troubleshooting Guide
A 51. If the same speaker remains distorted, the speaker or its wire is damaged. If the other speak- er distorts, the problem may be with the A 51, the surround controller, or a source component Switch the input cables. If distortion moves... -
Page 14: Servicing Your A
Procedure for Returning Your A 51 to Parasound for Service If Parasound determines that you should send your A 51 to Parasound, you will be given a Return Authorization (RA) number. This RA number must be clearly marked on the outer carton only. -
Page 15: Technically Speaking
50 mV (fully counterclockwise) to a minimum sensitivity of 250 mV (fully clockwise). If you set this control to 50 mV, the A 51 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 16 Extra washers are available from rack manufacturer Middle Atlantic Products, www.middleatlantic.com. 3. Use the Ground switch on the A 51 to eliminate most ground loops. This separates the A 51’s signal input ground from its chassis ground to isolate unwanted voltage in the ground shield of the unbalanced (RCA) input cable.
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Page 17: Parasound A 51 Design Overview
Relay-Bypassed Soft Start Circuit When the A 51 is first turned on, there is a significant amount of in-rush current required to charge the enor- mous power supply capacitors. In order to suppress... - Page 18 It operates out- side the audio signal path to keep the DC offset at the output of the A 51 at a constant 0.00 Vdc. The results are startling clarity, freedom from listening fatigue, and formidable bass response.
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Page 19: Parasound A 51 Specifications
PARASOUND A 51 SPECIFICATIONS Power Output - All Channels Driven 250 watts RMS x 5, continuous, 20 Hz - 20 kHz, 8 400 watts RMS x 5, continuous, 20 Hz - 20 kHz, 4 Current Capacity 60 amperes peak per channel Slew Rate >... - Page 20 Parasound Products, Inc. 950 Battery Street, San Francisco, CA 94111 415-397-7100 / Fax 415-397-0144 www.parasound.com...
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