Parasound A 21 manual Parasound a 21 Specifications

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19PARASOUND A 21 SPECIFICATIONS

Power Output - Both Channels Driven

250 watts RMS x 2, continuous,

20 Hz - 20 kHz, 8 Ω

400 watts RMS x 2, continuous,

20 Hz - 20 kHz, 4 Ω

Power Output - Mono

750 watts RMS, 20 Hz - 20 kHz, 8 Ω

Current Capacity

60 amperes peak per channel

Slew Rate

> 130 volts per microsecond

Frequency Response

5 Hz-100 kHz, +0/-3 dB at 1 watt

Total Harmonic Distortion

<0.2 % at full power

<0.03 % at typical listening levels

IM Distortion

< 0.04 %

TIM

Unmeasureable

Dynamic Headroom

> 1.5 dB

Interchannel Crosstalk

>80 dB at 1 kHz

>63 dB at 20 kHz

Input Impedance

Unbalanced: 33 kΩ

Balanced: 66 kΩ

Input Sensitivity for 28.28 V Output into 8 Ω

Unbalanced: 1 V

Balanced: 1 V per leg

Features and specifications subject to change

Loop Output Level

Same as input level

S/N Ratio

>112 dB, input shorted, IHF A-weighted

>102 dB, input shorted, unweighted

Damping Factor

> 1100 at 20 Hz

DC Trigger Requirements

+9 Vdc to +12 Vdc, 2 mA

Audio Trigger Requirements

50 mV AC - 200 mV AC

DC Trigger Output Capacity Requirements

+12 Vdc, 150 mA

Dimensions

Width: 17-1/2” (445 mm)

Panel height: 7” (178 mm)

Height with feet: 7-5/8” (194 mm)

Depth: 19-1/8” (485 mm)

Power Requirement

Standby: 25 Watts

Full Power into 4 Ω: 1500 Watts

Net Weight

60 lb. (27.3 kg)

Shipping Weight

74 lb. (33.7 kg)

V 1.0 © Parasound Products, Inc. 2002.

without notice.

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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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