• 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)

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

Download Manual

HiFi Review (HK) December 2018
"If you are pursuing a cost-effective multi-channel amplifier, the A 52+ is a trust-worthy great value five-channel amplifier that worth having!"

Enjoy the Music July 2018
"At all volumes, the Parasound A52+ amplifier never gave ground, nor quarter, to the Martin Logan Summits. Electrostatic speakers are notorious power hogs, and the Martin Logan Summits are no exception. They are uniquely talented at exposing any amplifier weaknesses. Impressively, the Parasound A52+ five-channel amplifier didn't flinch."

Stereophile May 2018
"The Halo A 52+ provided all the power that my speakers could handle, and did so with aplomb. The soundstage was consistent with no blurring of indi­vidual voices or instrumental details. The new Parasound showed its superiority in more graceful smoothness in the upper midrange and treble, and low bass that seemed better integrated with the upper bass. Overall, I really liked Parasound's Halo A 52+ in every way."

Sound and Vision April 2018
"Listening with the Halo A 52+ in my system was a pleasure. Intense dynamic contrasts literally caused me to sit up straight on my couch. Stereo and multichannel music also sounded great, making it a versatile all-around performer for entry-level and advanced home theaters alike."