Parasound A 21 manual Servicing Your a, If All Else Fails -Call Us for Help

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SERVICING YOUR A 21

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If All Else Fails –Call Us for Help

Call your Parasound dealer or Parasound’s Technical Service Department toll free at 1-866-770-TECH (8324). We can often solve the problem with simple diagnostic tests you can perform yourself. If we determine that your A 21 will need further inspection or servicing, we will:

a)Refer you to an authorized Parasound repair center near you, or

b)Authorize return of the unit to us and advise you of the correct procedure.

Procedure for Returning Your A 21 to Parasound for Service

If Parasound determines that you should send your A 21 to Parasound, you will be given a Return Authorization (RA) number. This RA number must be clearly marked on the outer

carton only.

IMPORTANT: Enclose a copy of your original purchase receipt. A unit is eligible for warranty repair ONLY when the purchase receipt shows that the unit was purchased from an Authorized Parasound Dealer. A unit obtained through unauthorized channels is not eligible for warranty repair. Parasound is not responsible for any sellers’ misrepresentations about our warranties or other service policies.

We do not accept any of the following:

Units with collect shipping charges

Units without a valid RA number

Units without a suitable shipping carton

Units for which we see or hear evidence of improper packing

For a non-warranty repair, contact us for an estimate of the repair charges before you ship the unit to us. The same packing and Return Authorization number procedures apply.

Important Notice - Shipping the A 21

Before shipping the unit to Parasound, you MUST re-pack the unit into its fitted molded foam insert sandwich and its original carton. If you do not have the original packing cartons and foam inserts, call us for new packing materials that we can provide to you for a nominal charge. Use of any other carton and packing materials will probably result in shipping damage, and refusal of the unit. Common carriers such as UPS seldom pay claims for damage incurred during shipment when a product is surrounded only with Styrofoam "peanuts" or otherwise improperly packed.

We cannot stress enough the importance of properly packing your A 21. Shipping damage resulting from inadequate packing can cost you a lot of money and significantly increase the time required for repair.

Ship the unit with adequate insurance. After repair under warranty, the unit will be returned to you via prepaid UPS within the continental United States.

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Contents Amplifier Keeping Records for Future Reference Congratulations and Thank You for Choosing ParasoundParasound Staff Unpacking Your a 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 Correct Speaker Polarity is Important Speaker Wire Length and Gauge thicknessSpeaker Terminals IMPORTANT! Before Trying Bridged Mono Configuring the a 21 for Bridged Mono OperationManual 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 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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