Parasound Halo A21+ Power Amplifier

Parasound's mission is to put great sound into stunning packages, priced magnitudes lower than any competitor. The results have been clear: Parasound products have won best-in-class awards in the most popular audiophile publications year after year.

Features

High bias Class A/AB operation

60 amperes peak current per channel

Stable with speaker impedance dips to 1.5 Ω

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 µF 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

Specifications

Power Output – Stereo Mode (0.1% THD)

300 watts x 2, 8 Ω both channels driven

500 watts x 2, 4 Ω both channels driven

ower Output – Bridged Mode (0.1% THD)

1000 watts x 1, 8 Ω

Bridged 4 Ω 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

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

Total Gain: 29 dB

Input Sensitivity for 28.28 V Output into 8 Ω

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

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)