A 52+ Five Channel Power Amplifier Halo

A 52+

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• 180 watts RMS x 5 @ 8 Ω
• 255 watts RMS x 5 @ 4 Ω
• 225 watts RMS x 2 @ 8 Ω
• 350 watts RMS x 2 @ 4 Ω
• Class A/AB circuitry designed by legendary John Curl
• Direct coupled - no capacitors or inductors in audio path ensures the cleanest signal
• Balanced XLR inputs with discrete circuits
• Full power is rated all the way down to 5Hz for unrestricted low-end bass
• Custom 1.5 kVA encapsulated toroid power transformer with independent secondary windings for each channel
• Hand-matched JFETs for input stage
• Hand-matched MOSFETs for driver stage
• Beta-matched 15 amp, 60 MHz bipolar output transistors (3 pairs per channel)
• 100,000 µF power supply filter capacitance
• DC Servo and relay protection circuits
• Auto turn on by audio signal or 12V trigger
• Heavy-duty 24k gold-plated, 5-way speaker terminals
• 3U chassis with updated cosmetics, rack mountable with HRA3 (sold separately)

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Power Output - All 5 Channels Driven 180 watts x 5, 8 Ω 255 watts x 5, 4 Ω

Power Output - 2 Channels Driven 225 watts x 2, 8 Ω 350 watts x 2, 4 Ω

Power measurements parameters with 120VAC 0.05% THD, RMS continuous power, full audio band (20 Hz - 20 kHz)

Current Capacity: 45 amperes peak, per channel

Dynamic Headroom: >1.5dB

Slew Rate > 130 volts per microsecond

Frequency Response 5 Hz - 100 kHz, +0/-3 dB 20 Hz - 20 kHz, +0/-0.3 dB

Total Harmonic Distortion (THD) < 0.05 % at full power < 0.03 % at typical listening levels

IM Distortion < 0.04 %

TIM Unmeasurable

Interchannel Crosstalk > 78 dB at 1 kHz > 63 dB at 20 kHz

Input Impedance Unbalanced: 47 kΩ Balanced: 94 kΩ, 47 kΩ per leg

Input Sensitivity for 28.28 V Output into 8 Ω Unbalanced: 1 V Balanced: 1 V per leg Total Gain: 29 dB

S/N Ratio > 112 dB, input shorted, IHF A-weighted > 102 dB, input shorted, unweighted

Damping Factor > 1100 at 20 Hz

DC Trigger Requirements +9 Vdc to +12 Vdc, 5 mA

Audio Trigger Requirements 2 mV - 10 mV

XLR Pin Identification 1 = Ground (Shield) 2 = Positive 3 = Negative (Return)

Dimensions Width: 17-1/4" (437 mm) Height without feet: 5-1/4" (133 mm) Height with feet: 5-7/8" (149 mm) Depth: 20" (508 mm) Depth with cables: 21-1/4" (540 mm)

Net Weight 55 lb. (25 kg)

Shipping Weight 69 lb. (31.3 kg)

Power Requirement Standby: 1 Watt Idle: 125 Watts Maximum: 1500 Watts