Parasound HALO A52+ Five Channel Power Amp

The Parasound A52+ is a versatile five-channel amplifier, delivering 180 watts per channel at 8 ohms. Its high-current design ensures powerful, clear sound, making it ideal for multi-room audio setups or home theaters. The A52+ combines power, efficiency, and precision to bring out the best in your speakers, whether used in stereo, multi-channel, or surround sound configurations.

• Power Output: 180 watts per channel at 8 ohms
• Design: High-quality components with balanced XLR and unbalanced RCA inputs
• Features: Energy-efficient design for cool operation
• Applications: Suitable for versatile multi-channel setups and home theater systems

The A52+ is the perfect blend of power and versatility, offering exceptional sound quality in both dedicated home theaters and multi-zone audio systems.

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)

Specifications

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