Parasound Halo A52+ 5 Channel 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

180 watts RMS x 5 @ 8 Ω

255 watts RMS x 5 @ 4 Ω

225 watts RMS x 2 @ 8 Ω

350 watts RMS x 2 @ 4 Ω

Class A/AB circuitry designed by legendary John Curl

Direct coupled - no capacitors or inductors in audio path ensures the cleanest signal

Balanced XLR inputs with discrete circuits

Full power is rated all the way down to 5Hz for unrestricted low-end bass

Custom 1.5 kVA encapsulated toroid power transformer with independent secondary windings for each channel

Hand-matched JFETs for input stage

Hand-matched MOSFETs for driver stage

Beta-matched 15 amp, 60 MHz bipolar output transistors (3 pairs per channel)

100,000 µF power supply filter capacitance

DC Servo and relay protection circuits

Auto turn on by audio signal or 12V trigger

Heavy-duty 24k gold-plated, 5-way speaker terminals

3U chassis with updated cosmetics, rack mountable with HRA3 (sold separately)

Specifications

Power Output - All 5 Channels Driven

180 watts x 5, 8 Ω

255 watts x 5, 4 Ω Power Output - 2 Channels Driven

225 watts x 2, 8 Ω

350 watts x 2, 4 Ω

Power measurements parameters with 120VAC

0.05% THD, RMS continuous power,

full audio band (20 Hz - 20 kHz)

Current Capacity:

45 amperes peak, per channel

Dynamic Headroom: >1.5dB

Slew Rate > 130 volts per microsecond

Frequency Response

5 Hz - 100 kHz, +0/-3 dB

20 Hz - 20 kHz, +0/-0.3 dB Total

Harmonic Distortion (THD)

< 0.05 % at full power

< 0.03 % at typical listening levels

IM Distortion < 0.04 %

Interchannel Crosstalk

> 78 dB at 1 kHz

> 63 dB at 20 kHz

Input Impedance

Unbalanced: 47 kΩ

Balanced: 94 kΩ, 47 kΩ per leg

Input Sensitivity for 28.28 V Output into 8 Ω

Unbalanced: 1 V

Balanced: 1 V per leg

Total Gain: 29 dB

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, 5 mA

Audio Trigger Requirements 2 mV - 10 mV

XLR Pin Identification

1 = Ground (Shield)

2 = Positive

3 = Negative (Return)

Dimensions

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

Height without feet: 5-1/4" (133 mm)

Height with feet: 5-7/8" (149 mm)

Depth: 20" (508 mm)

Depth with cables: 21-1/4" (540 mm)

Net Weight 55 lb. (25 kg)

Shipping Weight 69 lb. (31.3 kg)

Power Requirement

Standby: 1 Watt

Idle: 125 Watts

Maximum: 1500 Watts