Parasound Halo A-21

Parasound HALO A21 2 Channel
High Current Power Amp

We have a client who is doing massive
upgrade to his system and I am selling his 2 amps for him (which are listed under
separate listings). 

 This amplifier has a small nick on the top
edge toward the right side which you can see in one of the pictures which is barely noticeable but the fact that it is there is the only reason why this unit is rated 7/10.

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

88,000 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

 

Continuous power output:

250 watts RMS x 2, 20 Hz - 20 kHz, 8 Ω, all channels driven

400 watts RMS x 2, 20 Hz - 20 kHz, 4 Ω, all channels driven

750 watts RMS x 1, 20 Hz - 20 kHz, 8 Ω

Current capacity:

60 amperes peak per channel

Power bandwidth:

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

Total harmonic distortion:

< 0.2 % 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 unbalanced; 66 k Ω balanced

S/N ratio:

112 dB, input shorted, IHF A-weighted

Damping factor:

> 1100 at 20 Hz

Voltage:

110V - 120V

Dimensions:

17-1/2" w x 7-5/8" h x 20" d, 7" h without feet

Net weight: 60 lb.