Parasound Halo A51 Five Channel Amplifier
For sale, we have a fine example of the John Curl designed Parasound Halo A51 Five channel amplifier. The unit was taken in on a trade, and it is in perfect working order, and excellent physical condition. There are only minor blemishes, and a few marks on the rear heat sinks. This amp was in a custom system, and it was well cared for. See the many pictures in the listing for further details.
The amp went through our testing process on our bench where it performed flawlessly. At 250 Watts per channel at 8 0hms, this class A/AB amp will power pretty much any speakers you hood up to it. It has balanced XLR inputs, unbalanced RCA inputs, and 12V auto trigger amp turn-on capability.. It's a beast of an amp, and it is beautifully designed.
The amp will be carefully packed in a heavy duty box, and surrounded on all sides with several inches of polyethylene foam. Water activated, fiber reinforced tape will be used on all seams. Due to the weight and size, we will double box this amp, with the inner box surrounded on all sides with several inches of polyethylene foam. This box will also be sealed with the same fiber reinforced tape.
From Parasound:
Features
- 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
- 40 beta-matched 15 amp, 60 MHz bipolar output transistors
- 2.2 kVA encapsulated toroid power transformer with independent secondary windings for each channel
- 164,000 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
- 4u Chassis, carry handles, rack mounting adapter included
Specifications
- Power Output - All Channels Driven: 250 watts RMS x 5, continuous, 20 Hz - 20 kHz; 8Ω 400 watts RMS x 5, continuous, 20 Hz - 20 kHz, 4Ω
- 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: > 78 dB at 1 kHz; > 63 dB at 20 kHz
- Input sensitivity: 1 V for 28.28 V, THX Reference Lev
- Input impedance: 47 k Ω unbalanced; 94 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: 80 lb.