The Parasound HALO A31 multichannel amplifier is a power amplifier that draws directly from the hefty lineage of the 5 channel A51. Like it's bigger brother - the it's also a THX Ultra 2 certified product, but the interesting backdrop to the A 31 is that it was designed in response to increasing demand for a three channel power amp that holds nothing back in power or performance. So the A 31 is identical in performance and sound to the award winning Halo A 51.

Specifications and Features:

• 250 watts x 3 @ 8 Ohms / 400 watts x 3 @ 4 Ohms
• Adjustable gain for up to +6db over THX Reference level
• Unbalanced RCA and balanced XLR inputs
• Circuitry designed by legendary John Curl
• High bias class A/AB operation
• Direct coupled (no capacitors or inductors in signal path)
• Complementary MOSFET driver stage and JFET input stage
• 24 beta-matched 15 amp, 60 MHz bipolar output transistors
• 1.5 kVA encapsulated toroid power transformer with independent secondary windings for each channel
• 98,400 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
• THX Ultra2 certified
• Auto turn-on by 12v trigger or audio signal
• Continuous power output:
  250 watts RMS x 3, 20 Hz - 20 kHz, 8 Ω, all channels driven
  400 watts RMS x 3, 20 Hz - 20 kHz, 4 Ω, all channels driven
• 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)
• 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
• Dimensions: 17-1/2" w x 7-5/8" h x 20" d, 7" h without feet