Parasound A 21 manual Configuring the a 21 for Bridged Mono Operation

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CONFIGURING THE A 21 FOR BRIDGED MONO OPERATION

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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.

What You’ll Need:

•One length of speaker wire with banana plugs, spade lugs, or bare wires

•One shielded balanced or unbalanced interconnect cable for each A 21 used in bridged mono

•One loudspeaker with an impedance of 8 Ω or higher

Before Connecting

Remove power to all the components in your audio system.

Set the A 21 Stereo - Mono Bridge Switch to its Mono (up) position.

To Connect: From the Source

1Plug one end of the interconnect cable into the Balanced or Unbalanced Right Channel & Mono Input jack on the A 21

2Plug the other end of this cable into the desired output channel on the preamplifier or surround controller.

3Do not make any connection to either Left Channel Input jack on the A 21.

To Connect: To the Speaker

4Insert the wire with the ridge or other marking into the red Right + (positive) speaker terminal on the A 21. (This is the positive speaker terminal in bridged mono.)

5Insert the wire without the ridge or other marking into the Left + (positive) speaker terminal on the A 21. (This is the negative speaker terminal in bridged mono.)

6Insert the wire with the ridge or other marking into the red + (positive) terminal on the speaker.

7Insert the wire without the ridge or other marking into the black -- (negative) terminal on the speaker.

Components

8Do not make connections to either of the A 21's black speaker terminals.

OUTPUTS

Right

Left

2

Surround

Sound

Controller

Preamp

YOU SHOULD KNOW

IMPORTANT! - Before Trying Bridged Mono

1

3

4 5

88

6

7

Speaker

 

 

You should not connect a speaker with an impedance of less than 8 Ω to the A 21 when it is configured for bridged mono operation. Refer to Bridged Mono Operation in the Technically Speaking section for additional information about. Use the right channel Gain control to adjust level in the bridged mode.

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Contents Amplifier Congratulations and Thank You for Choosing Parasound Parasound Staff Unpacking Your aKeeping Records for Future Reference Amplifier Rack Mounting Your Parasound a Placement Guidelines for Your aBalanced XLR Jacks and Their Pin Configuration Before ConnectingLeft and Right Balanced Input Jacks What You’ll NeedInterconnect Cables and Their Color Codes Left and Right Unbalanced InputsLoop Out Connector Speaker Wire Length and Gauge thickness Speaker TerminalsCorrect Speaker Polarity is Important IMPORTANT! Before Trying Bridged Mono Configuring the a 21 for Bridged Mono OperationConnecting 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 Left and Right Channel Status Indicators On, Off and Fault/Protection Status IndicatorsHigh-Temp Indicator Ground Switch120 V or 220 V 240 V Operation AC Power ConnectionsMaintaining Your a Main Power FuseTrouble Probable Cause Remedy Troubleshooting GuideServicing Your a Procedure for Returning Your a 21 to Parasound for ServiceIf All Else Fails -Call Us for Help Important Notice Shipping the aBare Speaker Wire Ends Audio Trigger Sensitivity AdjustmentTechnically Speaking Balanced and Unbalanced LinesGround Loops Eliminating Hum and Buzz Choosing Interconnect Cables and Speaker WireLoop Out Jacks Gain ControlsParasound a 21 Design Overview Output Stage Driver 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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