Parasound
Parasound Halo A31 3 Channel Power Amplifier
Parasound Halo A31 3 Channel Power Amplifier
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Description
Parasound's Halo A31 power amplifier is the missing muscle your movies and music have been asking for. This amplifier locks everything in: voices stand center‑stage, low end digs deeper without bloat, and effects surge with head‑turning impact. Designed by legendary audio engineer John Curl, it runs high‑bias Class A/AB (the first ~7 watts in pure Class A) with a direct‑coupled signal path for maximum clarity. A 1.5 kVA toroidal transformer and 98,400 µF of filter capacitance supply clean current on demand, while 250 W x3 into 8 Ω (400 W x3 into 4 Ω), balanced XLR and RCA inputs, and THX Ultra2 certification make integration straightforward in serious home theaters.
Features & Specifications:
- 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
Specifications:
-
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
- Net weight: 65 lb.
- Shipping weight: 79 lb.
