Parasound A 21 manual AC Power Connections, V or 220 V 240 V Operation

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CONNECTING THE A 21 AC POWER CORD

AC Power Connections

We recommend that you plug your A 21 into the same AC wall outlet or power strip that powers your other audio components, especially the preamplifier or system controller. Having all the audio components on the same power circuit helps prevent hum caused by possible ground loops. The A 21 requires AC power that is continuous rather than switched on and off.

110 V - 120 V or 220 V - 240 V Operation

The A 21 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 21’s operating voltage involves rewiring internal connections for both its main power transformer and standby power transformer, plus changing fuse values. Since there is a risk of electric shock, voltage changes must be referred to a qualified technician.

What You’ll Need:

•An IEC 65 AC Cord (provided)

•An AC outlet or high quality AC power strip within reach of the AC cord

Before Connecting

Remove power to all the components in your audio system.

To Connect

1Plug the female end of the AC cord to the AC receptacle on the rear of the A 21.

2Plug the male end of the AC cord to an AC outlet or power strip.

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Contents Amplifier Keeping Records for Future Reference Congratulations and Thank You for Choosing ParasoundParasound Staff Unpacking Your a 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 Correct Speaker Polarity is Important Speaker Wire Length and Gauge thicknessSpeaker Terminals Configuring the a 21 for Bridged Mono Operation IMPORTANT! Before Trying Bridged MonoManual On-Off from the Front Panel Connecting an Active Audio Source for Automatic On-OffTurn Off Delay in the Audio Mode 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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