Parasound A 21 manual Left and Right Unbalanced Inputs, Interconnect Cables and Their Color Codes

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CONNECTING A STEREO PREAMPLIFIER OR A SURROUND CONTROLLER TO THE UNBALANCED INPUTS ON YOUR A 21

Left and Right Unbalanced Inputs

Use these inputs if your preamplifier or surround controller doesn’t have balanced output connectors or if you simply prefer to use unbalanced connections.

What You’ll Need:

Left

 

• A pair of shielded interconnect cables with RCA plugs

Right

• A source component with RCA output jacks

 

RCA Plugs

Before Connecting

Leave the AC cord on the A 21 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.

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.

To Connect

1

2

3&4

Plug one end of the cable into the Unbalanced Right Channel Input jack on the A 21.

Plug the other end of this cable into the unbalanced right channel output jack on your preamplifier (or a channel on your surround controller).

Repeat steps 1 and 2 for the left channel.

 

 

COMPONENTS

OUTPUTS

 

SURROUND

 

 

SOUND

Right

Left

CONTROLLER

or

 

 

 

 

PREAMP

2 4

1

3

YOU SHOULD KNOW

Interconnect Cables and Their Color Codes

Common color codes for input and output jacks are red for right and white for left. Match the colors at the outputs from your preamplifier or surround controller to the inputs on your A 21 so you’ll always hear the channels in their intended position.

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Contents Amplifier Congratulations and Thank You for Choosing Parasound Parasound Staff Unpacking Your aKeeping 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 Wire Length and Gauge thickness Speaker TerminalsCorrect Speaker Polarity is Important Configuring the a 21 for Bridged Mono Operation IMPORTANT! Before Trying Bridged MonoConnecting an Active Audio Source for Automatic On-Off Turn Off Delay in the Audio ModeManual 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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