Parasound Halo A51 5 Channel Amplifier

Very good condition sonic condition.  Some light surface scratches on face.

Circuitry designed by John Curl
THX Ultra 2 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 toroidal 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

Power output: 250 watts RMS x 5 continuous, 20 Hz - 20 kHz at 8 ohms; 400 watts RMS x 5 continuous, 20 Hz - 20 kHz at 4 ohms
Current capacity: 60 amps peak per channel
Frequency response: 5 Hz - 100 kHz, +0/-3 dB at 1 watt
Total harmonic distortion: <0.2% at full power, <0.03% at typical listening levels
IM distortion: <0.04%
TIM: Unmeasureable
Signal-to-noise ratio: >112 dB, input shorted, IHF A-weighted; 102 dB, input shorted, unweighted
Dynamic headroom: >1.5 dB
Interchannel crosstalk: >78 dB at 1 kHz, >63 dB at 20 kHz
Input impedance: unbalanced 47 K ohm, balanced 94 K ohm
Input sensitivity (for 28.28 V output into 8 ohm): unbalanced 1 V, balanced 1 V per leg
Slew rate: >130 volts per microsecond
Damping factor: >1100 at 20 Hz
DC trigger requirements: +9 VDC to +12 VDC, 2 mA
Audio trigger requirements: 50 mV AC - 250 mV AC
Power consumption: standby, 25 watts; full power into 4 ohms, 3000 watts
Weight: 97 lbs.
Dimensions: 17.5" wide, 20" deep, 7" high (7.625" with feet)