Parasound Halo Series A 21+ Stereo Power Amplifier | 500W x 2 Channels | Black

The Parasound Halo A 21+ is a high-current two-channel power amplifier suited to serious stereo systems and demanding audiophile installations. Housed in a 5U chassis weighing 88 lbs net, it drives 300 watts per channel into 8 ohms and 500 watts per channel into 4 ohms with both channels operating simultaneously, and scales to 1,000 watts into 8 ohms in bridged mono mode. It accepts both balanced XLR and unbalanced inputs.

The A 21+ draws up to 60 amps peak per channel and holds distortion to 0.1 percent THD. Frequency response spans 5 Hz to 100 kHz with no more than 3 dB rolloff, tightening to plus or minus 0.25 dB across the full audio band. Signal-to-noise ratio exceeds 115 dB IHF A-weighted. Channel separation is greater than 80 dB at 1 kHz. Gain is 29 dB, input sensitivity is 1V for both balanced and unbalanced connections, and the balanced input impedance is 66 kilohms.

Key Features

• 300W x 2 into 8 ohms, 500W x 2 into 4 ohms, both channels driven
• Bridged mono: 1,000W into 8 ohms
• 60 amps peak current per channel
• THD 0.1% at rated output
• SNR greater than 115 dB, IHF A-weighted
• Balanced XLR and unbalanced inputs
• Frequency response 5 Hz - 100 kHz, +0/-3 dB

Specifications

• Rack Spacing: 5U
• Channels: 2-Channel
• Watts Per Channel: 501-1000W
• Power Output @ 8 ohm: 300W x 2, 8 Ω both channels driven
• Power Output @ 4 ohm: 500W x 2, 4 Ω both channels driven
• Power Output Bridged @ 8 ohm: 1000W x 1, 8 Ω Bridged; 4 Ω operation is not recommended
• Power Consumption: Standby: 1W Idle (no music playing): 160W Typical Listening levels: 300W Maximum: 1400W
• Current Rating: 60 amps peak, per channel
• Total Harmonic Distortion (THD): 0.1% THD
• Power RMS: Yes
• Frequency Response: 5 Hz - 100 kHz, +0/-3 dB 20 Hz - 20 kHz, +0/-0.25 dB
• Audio Crosstalk: > 80 dB at 1 kHz > 70 dB at 20 kHz
• Impedance Input: Unbalanced: 33 kΩ Balanced: 66 kΩ,(33 kΩ per leg)
• Audio Gain: 29 dB
• Sensitivity Input: for 28.28 V Output into 8 Ω Unbalanced: 1 V Balanced: 1 V per leg
• Signal to Noise Ratio: > 115 dB, input shorted, IHF A-weighted > 110 dB, input shorted, unweighted
• Amplifier Requirements: Audio Trigger: 2 mV - 10 mV
• External Trigger Voltage: +9 Vdc to +12 Vdc, 5 mA
• Connectors: XLR Pin Identification 1 = Ground (Shield) 2 = Positive 3 = Negative (Return)
• Dimensions (W x H x D): 17.63" x 7.1" x 20" (448 x 181 x 508mm) (without feet) 17.63" x 7.75" x 20" (448 x 197 x 508mm) (with feet) Depth with cables: 21.5" (546 mm)
• Weight: Net Weight: 88 lbs (39.9 kg) Shipping Weight: 107 lbs (48.5 kg)