Parasound A 21 manual Placement Guidelines for Your a, Rack Mounting Your Parasound a

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PLACEMENT GUIDELINES FOR YOUR A 21

Power amplifiers are usually heavier and generate more heat than other components. To avoid damage to the A 21 or other equipment and to reduce risk of fire, you must follow these guidelines:

•Place the A 21 on a separate shelf that will adequately support its weight.

•Keep it away from heat sources such as air ducts or radiators.

•Avoid placing it on carpeting or another material that might obstruct airflow into the openings in the chassis bottom.

•Leave at least 3” of space around both sides and 6” of space above the top. The bottom clearance can be a little less.

•Do not block the front of the A 21 behind closed cabinet doors during use.

•Do not stack the A 21 with other components inside a cabinet unless you use a fan to circulate and exhaust the warm air that builds up between them.

Rack Mounting Your Parasound A 21

To mount the A 21 into a 19” wide equipment rack, you must first attach its rack mount brackets (provided). With its four feet removed, the A 21 chassis and front panel height occupies four rack spaces (7” or 176 mm). When mounting equipment below the A 21, you will also need to allow about 1/8” below the unit for the bottom chassis screws. A single standard rack space allows 1-3/4” vertical height in a 19" wide equipment rack. This measurement standard was developed by the EIA (Electronic Industries Association) so manufacturers of electronic components and equipment racks could build products in standardized heights that would fit in a uniform space. Please call your Parasound dealer or ParasoundTechnical Services if you need additional advice about rack mounting the A 21.

To attach the rack mount brackets:

•Remove the three screws from each side of the A 21. These are arranged vertically, behind its 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 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

Rack Mount Brackets Attached to A 21

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Contents Amplifier Parasound Staff Unpacking Your a Congratulations and Thank You for Choosing ParasoundKeeping Records for Future Reference Amplifier Placement Guidelines for Your a Rack Mounting Your Parasound aBefore Connecting Balanced XLR Jacks and Their Pin ConfigurationLeft and Right Balanced Input Jacks What You’ll NeedLeft and Right Unbalanced Inputs Interconnect Cables and Their Color CodesLoop Out Connector Speaker Terminals Speaker Wire Length and Gauge thicknessCorrect Speaker Polarity is Important Configuring the a 21 for Bridged Mono Operation IMPORTANT! Before Trying Bridged MonoTurn Off Delay in the Audio Mode Connecting an Active Audio Source for Automatic On-OffManual On-Off from the Front Panel Mm sub-mini plug Connecting the a 21 to Trigger Another Component On, Off and Fault/Protection Status Indicators Left and Right Channel Status IndicatorsHigh-Temp Indicator Ground SwitchAC Power Connections 120 V or 220 V 240 V OperationMain Power Fuse Maintaining Your aTroubleshooting Guide Trouble Probable Cause RemedyProcedure for Returning Your a 21 to Parasound for Service Servicing Your aIf All Else Fails -Call Us for Help Important Notice Shipping the aAudio Trigger Sensitivity Adjustment Bare Speaker Wire EndsTechnically Speaking Balanced and Unbalanced LinesChoosing Interconnect Cables and Speaker Wire Ground Loops Eliminating Hum and BuzzLoop Out Jacks Gain ControlsParasound a 21 Design Overview Driver Stage Output StageClass A-A/B Operation Total Protection DC ServosParasound a 21 Specifications Parasound Products, Inc Battery Street, San Francisco, CA

A 21 specifications

The Parasound A 21 is a high-performance power amplifier renowned for its exceptional audio quality and build integrity. It is designed to meet the demands of audiophiles and music enthusiasts, aiming to deliver an unparalleled listening experience. This amplifier stands out with a robust power output, delivering 250 watts per channel into 8 ohms and 400 watts into 4 ohms, providing ample power to drive a wide range of loudspeakers.

One of the key features of the Parasound A 21 is its ultra-linear Class AB amplification. This technology allows the amplifier to achieve high power without compromising on sound quality. The Class AB design is known for its low distortion and high efficiency, making it capable of reproducing dynamic music with clarity and precision. The A 21 also incorporates a toroidal transformer, which helps in producing clean power and minimizes electrical interference, ensuring that the sound remains unaffected by fluctuating power conditions.

The build quality of the A 21 is exceptional, with a sturdy chassis designed to minimize vibrations and enhance performance. The amplifier is housed in a sleek, attractive enclosure that not only looks elegant but also provides adequate heat dissipation. This is a crucial aspect, as it ensures the amplifier operates efficiently without overheating during extended listening sessions.

In terms of connectivity, the Parasound A 21 features balanced XLR and unbalanced RCA inputs, allowing users to integrate it seamlessly into various audio systems. The amplifier also has a 12V trigger input, enabling remote operation which can be a significant convenience for users with complex audio setups.

The A 21 is built with high-quality components, including high-current power supply capacitors and output transistors, further enhancing its reliability and performance. Its sound signature is characterized by an expansive soundstage, detailed mids, and deep, controlled bass, making it suitable for a diverse range of music genres.

For those seeking an amplifier that combines power, precision, and aesthetic appeal, the Parasound A 21 is a standout choice. It delivers an impressive blend of technological advancements and user-friendly features, ensuring that audiophiles can enjoy their favorite music as it was meant to be heard. Overall, the A 21 exemplifies Parasound’s commitment to excellence and remains a trusted option in high-fidelity audio systems.
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