Parasound Halo A21+ Stereo Power Amplifier (Black)

High-current Class AB stereo power amplifier engineered for refined and dynamic two-channel performance
Robust power supply with large toroidal transformer provides stable current reserves and strong transient response
Balanced (XLR) and unbalanced (RCA) inputs for flexible integration with preamplifiers, DACs, and home audio components
Independent gain controls for precise level adjustment and system matching
Bridgeable mono mode to combine channels for higher power output when needed
Low noise and low distortion design for transparent, natural sound reproduction
Comprehensive protection circuitry including thermal, over-current, and DC safeguards for reliable operation
Loop outputs for adding additional amplification or multi-room setups
Automatic turn-on options via 12V trigger or audio signal sensing
Solid, heavy-duty chassis with premium black finish suitable for home and custom installations
Ideal choice for driving a wide range of speakers in high-fidelity music or home theatre stereo applications

Description

Power Output – Stereo Mode (0.1% THD)	300 watts x 2, 8 Ω both channels driven 500 watts x 2, 4 Ω both channels driven
TIM	Unmeasurable
Audio Trigger Requirements	2 mV – 10 mV
Power Output – Bridged Mode (0.1% THD)	1000 watts x 1, 8 Ω Bridged 4 Ω operation is not recommended
Inter-channel Crosstalk	> 80 dB at 1 kHz > 70 dB at 20 kHz
XLR Pin Identification	1 = Ground (Shield) 2 = Positive 3 = Negative (Return)
Power measurements are at 120 VAC	0.1% THD, RMS continuous power, full audio band (20 Hz – 20 kHz)
Input Impedance	Unbalanced: 33 kΩ Balanced: 66 kΩ,(33 kΩ per leg)
Dimensions	Width: 17-5/8″ (448 mm) Height without feet: 7-1/8″ (181 mm) Height with feet: 7-3/4″ (197 mm) Depth: 20″ (508 mm) Depth with cables: 21-1/2″ (546 mm)
Current Capacity	60 amps peak, per channel
Total Gain	29 dB
Slew Rate	> 130 volts per microsecond
Input Sensitivity for 28.28 V Output into 8 Ω	Unbalanced: 1 V Balanced: 1 V per leg
Net Weight	71 lb. (32.2 kg)
Frequency Response	5 Hz – 100 kHz, +0/-3 dB 20 Hz – 20 kHz, +0/-0.25 dB
S/N Ratio	> 115 dB, input shorted, IHF A-weighted > 110 dB, input shorted, unweighted
Shipping Weight	88 lb. (39.9 kg)
Total Harmonic Distortion (THD)	< 0.1 % at full power < 0.03 % at typical listening levels
Damping Factor	> 1100 at 20 Hz
Power Requirement	Standby: 1 Watt Idle (no music playing): 160 Watts Typical Listening levels: 300 Watts Maximum: 1400 Watts
IM Distortion	< 0.04 %
DC Trigger Requirements	+9 Vdc to +12 Vdc, 5 mA

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