Parasound A 21 manual Manual On-Off from the Front Panel, Turn Off Delay in the Audio Mode

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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.

Manual On-Off from the Front Panel

If you want to manually turn on and off the A 21 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.

Connecting an Active Audio Source for Automatic On-Off

If you want to automatically turn on the A 21 whenever music is playing (an audio signal is present), choose the audio triggering option by moving the Auto Turn On switch to its upper Audio position.

What You’ll Need:

• An audio source that's playing

Before Connecting

Remove power to all the components in your audio system.

Make sure the Auto Turn On switch on the A 21 is in its Audio (up) position.

Set the Audio triggering Sensitivity adjustment knob on the rear panel to the desired level. Start with the 12 o’clock position.

To Connect

Connect an active audio source to either the Left or Right Balanced or Unbalanced Input jacks. (Refer to to pages 2 and 3).

Start Sensitivity at 12 o'clock

1

Switch in up position

 

YOU SHOULD KNOW

Turn Off Delay in the Audio Mode

When the music (audio signal) stops, the A 21 will remain turned on for about five minutes. This delay prevents unwanted turn-off during silent passages in music or pauses between

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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 aLeft and Right Balanced Input Jacks Before ConnectingBalanced XLR Jacks and Their Pin Configuration 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 High-Temp Indicator On, Off and Fault/Protection Status IndicatorsLeft and Right Channel Status Indicators Ground SwitchAC Power Connections 120 V or 220 V 240 V OperationMain Power Fuse Maintaining Your aTroubleshooting Guide Trouble Probable Cause RemedyIf All Else Fails -Call Us for Help Procedure for Returning Your a 21 to Parasound for ServiceServicing Your a Important Notice Shipping the aTechnically Speaking Audio Trigger Sensitivity AdjustmentBare Speaker Wire Ends Balanced and Unbalanced LinesLoop Out Jacks Choosing Interconnect Cables and Speaker WireGround Loops Eliminating Hum and Buzz Gain ControlsParasound a 21 Design Overview Class A-A/B Operation Driver StageOutput Stage 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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