The Parasound A 51 five-channel power amplifier delivers 250 watts of Class A/AB power into 8 Ohm and 400 watts into 4 Ohm. As part of Parasound’s Halo amplification series designed by the legendary John Curl you are guaranteed powerful precise sound, the A 51 will perform even in the largest of cinema rooms. Sydney Hi-Fi Castle Hill uses the Parasound Halo series extensively when designing and installing Trinnov immersive audio cinemas.
Parasound A 51 Features and Specifications:
- 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 the 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
Continuous power output:
250 watts RMS x 5, 20 Hz – 20 kHz, 8 Ω, all channels driven
400 watts RMS x 5, 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 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:
17-1/4″ w x 7-5/8″ h x 20″ d, 7″ h without feet
Net weight: 80 lb.
