Parasound Halo A23+ 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

45 amperes peak current per channel

Stable with speaker impedance dips below 2 Ω

Balanced inputs with discrete circuits

Heavy-duty 24k gold-plated 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

12 beta-matched 15 ampere, 60 MHz bipolar output transistors

1.1 kVA shielded toroid transformer w/ independent windings for each channel

Independent power supplies for input stage, driver stage and output stage

54,400 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

2 rack space chassis with rear carry handles

Rack mount hardware available separately

Specifications

Power Output – Stereo Mode (0.06% THD)

160 watts x 2, 8 Ω both channels driven

240 watts x 2, 4 Ω both channels driven Power Output – Stereo Mode (0.9% THD)

210 watts x 2, 8 Ω both channels driven

300 watts x 2, 4 Ω both channels driven Power Output – Bridged Mode (0.06% THD)

500 watts x 1, 8 Ω

Bridged 4 Ω operation is not recommended Power Output – Bridged Mode (0.9% THD)

600 watts x 1, 8 Ω

Bridged 4 Ω operation is not recommended

Current Capacity: 45 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)

< 0.06 % at full power

< 0.03 % at typical listening levels

Input Impedance

Unbalanced: 33 kΩ

Balanced: 66 kΩ,(33 kΩ per leg)

Input Sensitivity for 28.28 V Out (8 Ω Load)

Unbalanced: 1 V

Balanced: 1 V per leg

S/N Ratio

> 112 dB, input shorted, IHF A-weighted

> 107 dB, input shorted, unweighted

Damping Factor: > 800 at 20 Hz

Dimensions

Width: 17-1/4" (437 mm)

Depth: 15"-1/4" (388 mm)

Depth, with cables 17" (432 mm)

Height, with feet: 4-1/8" (105 mm)

Height, without feet: 3-1/2" (89 mm), 2U

Net Weight: 27 lb. (12.2 kg)

Shipping Weight: 34 lb. (14.4 kg)