A 52+

    Features 

·         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)

 

 (Click to enlarge)

   Specs 

• 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