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Parasound Halo A21 Amplifier

The Halo A21 stereo amplifier designed by John Curl shows Parasound’s build quality throughout. This component is perfect for the audiophile on a budget. The Halo A21 is one of today’s best values in the world of high-end amplifiers.

  •  Circuitry designed by legendary John Curl
  •  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
  •  16 beta-matched 15 amp, 60 MHz bipolar output transistors
  •  1.2 kVA encapsulated toroid power transformer with independent
    secondary windings for each channel
  •  100,000 µF power supply filter capacitance
  •  DC Servo and relay protection circuits
  •  AC present, channel status, high temperature indicators
  •  Heavy-duty 24k gold-plated 5-way speaker terminals
  •  Gold-plated RCA input jacks; ground lift switch
  •  Auto turn-on by 12v trigger or audio signal, 12v trigger out
  •  4u Chassis, carry handles, rack mounting adapter included
  •  Parasound 5 year parts, 5 years labor warranty
    (For USA and Canada purchases only)
Specifications

Halo A21 Specifications:

Continuous power output, 20Hz – 20 kHz:
400 watts RMS x 1, 8 Ω
800 watts RMS x 1, 4 Ω
1200 watts RMS x 1, 2 Ω

Class A power output, 20Hz – 20 kHz:
25 watts, bias set to high, 8 Ω
10 watts, bias set to low, 8 Ω

Current capacity:
135 amperes peak

Power bandwidth:
2 Hz – 120 kHz, +0/-3 dB at 1 watt

Total harmonic distortion:
< 0.15 % at full power IM distortion: balanced 16 V rms
< 0.03 % Slew rate: > 130 V/µsecond

Dynamic headroom: > 1.8 dB

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

Input impedance: 100 k Ω

S/N ratio:
>120 dB, IHF A-weighted, bias set to high
>122 dB, IHF A-weighted, bias set to low

Damping factor: > 1200 at 20 Hz

Power Requirement :
250 watts idle 1280 watts full power into 4 Ω

DC trigger output capacity : +12 Vdc, 150 mA

Dimensions

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Choice Audio is a high-end audio company serving Minneapolis, St. Paul, Rochester, western Wisconsin and Minnesota