Parasound Halo A-51 five channel amp.

THX Ultra2 certified, 5 ch. Home Theater amplifier.  Great sound, dynamic, tight base, powerful.  
 The A-51 is an extremely powerful, yet finessed 5 channel amplifier, putting out 250 pristine watts into 8 ohms; 400 watts into 4 ohms. The A-51, like the rest of the Halo series, was designed by John Curl, and operates in pure Class A up to the first 7.5 watts before transitioning into Class AB operation. Under the hood it packs a 2.2 kVA toroid transformer with 164,000 µF filter capacitance - so there is almost nothing it can't drive with authority.  The A51 is a high-bias Class A/AB operating amp in a direct-coupled design with no capacitors or inductors in the signal path, powered by a massive toroid transformer. The A51 uses a MOSFET driver stage complemented by a JFET input stage. The A51 features both balanced and unbalanced input connections, as well as 24-karat gold five-way binding posts. It features large heat sinks along both the right and left sides, as well as down the center of the rear panel, separating the inputs from the binding posts to dissipate some of that class A heat. The A51 has a 12-volt trigger, as well as a detachable power cord, and comes standard with rack-mounting equipment, which is almost unheard of with an amp costing as little as the A51
Summary of attributes: -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
-4u Chassis, carrying handles, rack mounting adapter included
-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: 77 lbs.
-Shipping weight: 92 lb.
-Dimensions: 17.5" wide, 20" deep, 7" high (7.625" with feet)

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