Parasound - A 21+ Stereo Power Amplifier

A 21+ Stereo Power Amplifier

Parasound A21
Halo Collection

Quick Specs

Type: Amplifier
Width: 17 1/4"
Height: 7 5/8"
Depth: 19 1/8"
Energy Star Rated: No

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by Parasound

Halo by Parasound, our premier product line, marks a new standard for sound and style. Every Halo model has earned an unprecedented number of rave reviews from the top critics in the audio / video industry.

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Changes from the original A 21 A 21+

250 300 Watts (8 )
400 500 Watts (4 )
750 1000 Watts (bridged)
Filter cap: 88,000 uF 108,000 uF
S/N: 112dB 115 dB
THD (at full power): 0.2% 0.1%
Crosstalk (20kHz): 63dB 70dB
Transformer size: 1.2 kVA 1.3 kVA
Weight: 60 LB 71 LB
Refined Halo cosmetic with aluminum end caps & gold highlights
Updated rear panel with heavy duty speaker terminals from JC 5
Upgraded internal gold on gold audio connections
Updated auto turn on circuit

All Features

300 watts x 2 @ 8 RMS, both channels driven
500 watts x 2 @ 4 RMS, both channels driven
1000 watts x 1 @ 8 , in bridged mode
Circuitry designed by legendary John Curl
High bias Class A/AB operation
60 amperes peak current per channel
Stable with speaker impedance dips to 1.5
Balanced inputs with discrete circuits
CHK Infinium, custom 5-way speaker binding posts
Gold-plated RCA input & loop output jacks
Direct-coupled signal path, no capacitors or inductors
DC Servo and relay protection circuits
AC turn-on inrush surge protection with relay bypass
JFET input stage, MOSFET driver stage
16 beta-matched 15 ampere, 60 MHz bipolar output transistors
1.3 kVA shielded toroid transformer w/ independent windings for each channel
Independent power supplies for input stage, driver stage and output stage
108,000 F filter capacitors for output stages
Full power is rated all the way down to 5Hz for unrestricted low-end bass
Harris hyper-fast soft-recovery bridge diode rectifiers
Automatic turn-on by 12 V trigger or audio sensing
4 rack space chassis with rear carry handles
Rack mount hardware is included
Available in silver or black

Power Output - Stereo Mode (0.1% THD)	300 watts x 2, 8 both channels driven 500 watts x 2, 4 both channels driven
Power Output - Bridged Mode (0.1% THD)	1000 watts x 1, 8 Bridged 4 operation is not recommended Power measurement are at 120 VAC: 0.1% THD, RMS continuous power, full audio band (20 Hz - 20 kHz)
Current Capacity	60 amps peak, per channel
Slew Rate	> 130 volts per microsecond
Frequency Response	5 Hz - 100 kHz, +0/-3 dB 20 Hz - 20 kHz, +0/-0.25 dB
Total Harmonic Distortion (THD)	< 0.1 % at full power < 0.03 % at typical listening levels
IM Distortion	< 0.04 %
TIM	Unmeasurable
Inter-channel Crosstalk	> 80 dB at 1 kHz > 70 dB at 20 kHz
Input Impedance	Unbalanced: 33 k Balanced: 66 k ,(33 k per leg)
Total Gain	29 dB
Input Sensitivity for 28.28 V Output into 8	Unbalanced: 1 V Balanced: 1 V per leg
S/N Ratio	> 115 dB, input shorted, IHF A-weighted > 110 dB, input shorted, unweighted
Damping Factor	> 1100 at 20 Hz
DC Trigger Requirements	+9 Vdc to +12 Vdc, 5 mA
Audio Trigger Requirements	2 mV - 10 mV
XLR Pin Identification	1 = Ground (Shield) 2 = Positive 3 = Negative (Return)
Dimensions	Width: 17-5/8" (448 mm) Height without feet: 7-1/8" (181 mm) Height with feet: 7-3/4" " (197 mm) Depth: 20" (508 mm) Depth with cables: 21-1/2" (546 mm)
Net Weight	71 lb. (32.2 kg)
Shipping Weight	88 lb. (39.9 kg)
Power Requirement	Standby: 1 Watt Idle (no music playing): 160 Watts Typical Listening levels: 300 Watts Maximum: 1400 Watts

Quick Specs

Appearance
Type: Amplifier
Dimensions
Width: 17 1/4"
Height: 7 5/8"
Depth: 19 1/8"
Features
Energy Star Rated: No

A 21+ Owner s Guide

Parasound Amp BTU Ratings

CHK Spade Terminal Compatibility

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