Parasound A 51 Amplifier Halo

A 51

FeaturesSpecsReviewsSupport

• 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 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

A 51

FeaturesSpecsReviewsSupport

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: 17-1/2" w x 7-5/8" h x 20" d, 7" h without feet

Net weight: 80 lb.