Parasound
Parasound Halo A52+ 5 Channel Power Amplifier
Parasound Halo A52+ 5 Channel Power Amplifier
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Description
Parasound's Halo A52+ 5 channel power amplifier in your system will wake the whole room up! Voices lock center‑stage, bass tightens without bloat, and big moments hit with the kind of weight that turns movie night into a grin‑inducing event—no rack overhaul required. Designed by John Curl, the A52+ runs high‑bias Class A/AB in a direct‑coupled topology for effortless clarity. It delivers 180 W x5 into 8 Ω (255 W x5 into 4 Ω) with a custom 1.5 kVA toroidal transformer (independent secondary windings per channel) and 100,000 µF of reserve for clean current on demand. Full power is rated down to 5 Hz, and integration is simple: five XLR + five RCA inputs, plus 12 V trigger or audio‑sense auto‑on for any AVR/processor with pre‑outs.
Features & Specifications:
- 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
-
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
