Parasound Halo A52+ 5 Channel Power Amplifier




The Parasound HALO A52+ is a new addition for 2018 to the HALO multichannel stable.

The A 52+ is based on Parasound's previous and highly successful A 52 model, and features significant upgrades in power output, circuitry refinements, and of course features the latest Halo styling.

The new model increases available power from 125 to 180 watts per channel into 8 ohms and 255 watts into 4 ohms, with all channels driven. As with its predecessor, the Parasound Halo A 52+ is the work of audio legend John Curl, using high-bias Class A/AB and direct-coupled circuit topology.

The Parasound Halo A 52+ features a larger custom-made toroidal power transformer to support its higher power output. It has five RCA unbalanced and five balanced XLR inputs, a separate module for each channel, DC Servos and relays to protect the amp and speakers.

Features include automatic turn-on, a 3U chassis with rear carry handles which is rack mountable with optional adaptors.

The Parasound Halo A 52+ has a black anodized extruded front panel with new solid aluminum end-caps that are milled and hand-polished. These represent a fresh and refined Halo aesthetic

The Parasound Halo A52+ is available in black.

Parasound Halo A52+ Multi-Channel Amplifier Features & Benefits:

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)

Parasound Halo A52+ Multi-Channel Amplifier 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
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 %
TIM: Unmeasurable
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)
  Width: 437 mm
  Height without feet: 133 mm
  Height with feet: 149 mm
  Depth: 508 mm
  Depth with cables: 540 mm
Net Weight: 25 kg
Shipping Weight: 31.3 kg

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