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HALO A23+ Power Amp Black
HALO A23+ Power Amp Black
HALO A23+ Power Amp Black
HALO A23+ Power Amp Black
HALO A23+ Power Amp
ParasoundNew

HALO A23+ Power Amp Black

Model AA23PB · Series HALO

Space-saving stereo amp with 120Wpc of Class A/AB power. The A23+ offers rich sound, clean detail, and versatile system flexibility in a compact chassis.

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At a glance

All specifications
Current Capacity
45 amps peak, per channel
Slew Rate
> 130 volts per microsecond
IM Distortion
< 0.04 %
TIM
Unmeasurable
Total Gain
29 dB
Damping Factor
> 800 at 20 Hz
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Overview

Two-Channel Power with Elegance and Precision

The Parasound A23+ brings studio-level amplification into your listening room—delivering clarity, depth, and control that defies its compact size.

Co‑designed by legendary engineer John Curl, it features a dual-mono Class A/AB architecture with independent transformers per channel. With 160 W per channel into 8 Ω (240 W into 4 Ω) and bridgeable to 500 W, along with balanced XLR and gold-plated RCA inputs, the A23+ integrates seamlessly into stereo or home theater systems.

Praised by reviewers:

SoundStage! – “Parasound provides great value… I haven’t heard better sound or seen higher build quality at this price. An impressive power amplifier.”

Home Theater Hi-Fi – “Solidly constructed and good‑looking amplifier… Balanced sonic characteristics with good presentation of musical details.”

The Audio Tailor – Highlights “transparency from a sonorous 5 Hz sub-bass right through to 100 kHz,” pointing to exceptional clarity and signal purity.

Highlights

  • 160 watts x 2 @ 8 Ω RMS, both channels driven
  • 240 watts x 2 @ 4 Ω RMS, both channels driven
  • 500 watts x 1 @ 8 Ω, in bridged mode
  • Circuitry designed by legendary John Curl
  • High bias Class A/AB operation
  • 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
  • Available in silver or black

Specifications

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 *All Power measurement are at 120 VAC, RMS continuous power, full audio band (20 Hz - 20 kHz)
Current Capacity
45 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)
< 0.06 % at full power < 0.03 % at typical listening levels
IM Distortion
< 0.04 %
TIM
Unmeasurable
Inter-channel Crosstalk
> 85 dB at 1 kHz > 70 dB at 20 kHz
Input Impedance
Unbalanced: 33 kΩ Balanced: 66 kΩ,(33 kΩ per leg)
Total Gain
29 dB
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
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) 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)
Power Requirement
Standby: <1 Watt Idle (no music playing): 75 Watts Typical Listening levels: 125 Watts Maximum: 800 Watts 110-125 VAC 60 Hz or 220-250 VAC 50 Hz AC mains voltage is set on rear panel

Downloads

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Awards and press

5

  • The Parasound P 6 and Parasound A 23+ play together in a pleasingly balanced and precise manner, while still musical with tonality that tends toward warmth. The consistently very supple reproduction and simultaneously true-to-size presentation and pin-point positioning of individual instruments and voices is amazing. Yes, this is how HiFi is fun.

    LowBeats (Germany) November 2020

  • There is a lot to like in the reasonably-priced Parasound HALO A 23+ stereo amplifier. It is stylish, packs sufficient amplification power, and delivers solid high-fidelity sonic performance.

    Secrets of Home Theater & High Fidelity, November 2020

  • One strength is its capability to reproduce a wide sonic palette, with depth and plenty of micro information. Parasound's power amp is able to bring out the best bass from speakers. Different kinds of music made us appreciate the unusual character of this amplification. Outstanding!

    ON-OFF (Spain) September, 2019

  • Parasound provides great value in the Halo A 23+. I haven't heard better sound or seen higher build quality at this price. An impressive power amplifier.

    Soundstage Network July 2019 Reviewer's Choice

  • Together, the Parasound P 6 and A 23+ are dynamite. Pure sonic magic with brilliant dynamics, delicious midrange and impressive resolution. To get such good sound for the price of this duo seems almost unnatural. One incredibly appealing preamp-amplifier package from Parasound.

    Stereo+ (Norway) January 2019

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