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Parasound Halo A23 Two Channel Amplifier
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Parasound Halo A23 Two Channel Amplifier

£999.17 Exc. VAT |  


Parasound Halo A23 Multi Channel Amplifier

Parasound’s Halo A 23 Amplifier is the ultimate combination of cutting edge technology, superb craftsmanship, and stunning industrial design. With high current Class A/AB amplification, smooth sounding MOSFET drivers, and balanced XLR inputs, this mighty amp will make any speaker sound better than ever before. The A 23 two channel amplifier boasts 125 watts of THX Ultra 2 certified power per channel, and it looks as amazing as it sounds. Whether it’s movies or music, the A 23 will knock your socks off!

As the A23 is based on a John Curl design (akin to the A21, A31 and A51) it boasts the exemplary qualities you'd expect - but at a lower price point than the more prominent A21. The A23 like it's two channel stable-mates can be used to stunning effect with the Parasound range of pre-amplifiers such as the JC3+, P5 or the larger and flexible P7 - perhaps within a multi-channel application. It can of course be used effectively as a 'mono-block' in bridged mono mode as well meaning that you can get a very dexterous 400 watts into an 8ohm load for those of you requiring huge power into larger more challenging loads or larger spaces.

As you would expect the build quality and components used in the A23 are like all of Parasound's range - very high quality. The A23 features both balanced and unbalanced inputs (RCA's are gold plated) with a designated ground lift switch, and these high quality inputs are matched with heavy-duty 24k gold-plated 5-way speaker terminals on the output stage. For those also wanting to tweak their systems to THX certified installations the A23 features adjustable gain pots for up to THX Reference level.

Despite it's impeccable 'HiFi' credentials (as it has like a host of Parasound's amps - been extremely well reviewed) - the A23 also can be mounted via a set of optional rack ears and has a choice of power activation (front panel, auto sensing and 12v) to ensure that for those wanting the best sound in a custom installation, the A23 becomes a mandatory option.

The Parasound Halo A23 is available in black and silver finishes - please specify on order.


  • Circuitry designed by legendary John Curl
  • Lucasfilm Home THX Ultra2 certified
  • High bias Class A/AB operation
  • Balanced inputs with discrete circuits and XLR connectors
  • Direct Coupled - no capacitors or inductors in signal path
  • Complementary MOSFET driver stage and JFET input stage
  • 12 beta-matched 15 amp, 60 MHz bipolar output transistors
  • 1 kVA encapsulated toroid power transformer with independent secondary windings for each channel
  • 48,000 µF power supply filter capacitance
  • DC Servo and relay protection circuits
  • AC present, channel status, high temperature displays
  • Heavy-duty 24k gold-plated 5-way speaker binding posts
  • Gold-plated RCA input jacks; loop output jacks
  • Auto turn-on by 12v trigger or audio signal
  • Rear mounted gain controls, ground lift switch
  • 2u Chassis, carry handles, rack mountable with HRA2 (sold separately)

Continuous power output:

  •  125 watts RMS x 2, 20 Hz - 20 kHz, 8 Ω, both channels driven
  •  225 watts RMS x 2, 20 Hz - 20 kHz, 4 Ω, both channels driven
  •  400 watts RMS x 1, 20 Hz - 20 kHz, 8 Ω

Current capacity: 45 amperes peak per channel

Power bandwidth: 5 Hz - 100 kHz, +0/-3 dB at 1 watt

Total harmonic distortion: < 0.06 % at full power

IM distortion: balanced 16 V rms < 0.04 %

Slew rate: > 130 V/µsecond

Dynamic headroom: > 1.5 dB

Interchannel crosstalk: > 80 dB at 1 kHz; > 63 dB at 20 kHz

Input sensitivity: 1 V for 28.28 V, THX Reference Level

Input impedance: 33 k Ω

S/N ratio: 112 dB, input shorted, IHF A-weighted

Damping factor: > 800 at 20 Hz

Voltage: 110V - 120V or 220V - 240V

Width: 17-1/2” (437 mm)

Panel height: 3-1/2” (88 mm)

Height with feet: 4-1/8” (105 mm)

Height With Rack Adapter: 3-5/8" (92mm)

Depth: 13-3/4” (350 mm)

Power Requirement

  •  Standby: 25 Watts
  •  Full Power into 4 Ω: 700 Watts

Net Weight: 28 lb. (12.7 kg)

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