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Parasound Halo A 21+ Stereo Power Amplifier
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Parasound Halo A 21+ Stereo Power AmplifierParasound Halo A 21+ Stereo Power AmplifierParasound Halo A 21+ Stereo Power Amplifier
Parasound Halo A 21+ Stereo Power AmplifierParasound Halo A 21+ Stereo Power Amplifier

Parasound Halo A 21+ Stereo Power Amplifier

£3,499.95    
£2,916.63 Exc. VAT |  
  

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Parasound Halo A 21+ Stereo Power Amplifier

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Features include: Circuitry designed by legendary John Curl. Upgraded power output, transformer, filter capacitance, internal connections, speaker terminals and cosmetics.High bias Class A/AB operation. Direct Coupled. DC Servo and relay protection circuits. 2 x XLR inputs (with discrete circuits). 2 x RCA inputs (with loop output). Independent gain controls for each channel. Ground lift controls. Input selector controls (XLR/RCA). Bridged/Stereo switch. Audio sensing on/off (with sensitivity controls). 12V trigger input & output. Power output: 300 watts RMS x 2 at 8 Ω. 500 watts RMS x 2 at 4 Ω, all channels driven.

Bridged Mode: 750-1000 watts at 8 Ω. Heavy-duty 24k gold-plated 5-way speaker binding posts. Gold-plated RCA input/output jacks. 4U Chassis. Rear carry handles. Rack mounting adapter included Available in black or silver finishes. 

Changes from the original A 21→A 21+

  • 250 → 300 Watts (8Ω)
  • 400 → 500 Watts (4Ω)
  • 750 → 1000 Watts (bridged)
  • Filter cap: 88,000 uF → 108,000 uF
  • S/N: 112dB → 115 dB
  • THD (at full power): 0.2% → 0.1%
  • Crosstalk (20kHz): 63dB → 70dB
  • Transformer size: 1.2 kVA → 1.3 kVA
  • Weight: 60 LB → 71 LB
  • Refined Halo cosmetic with aluminum end caps & gold highlights
  • Updated rear panel with heavy duty speaker terminals from JC 5
  • Upgraded internal gold on gold audio connections
  • Updated auto turn on circuit

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

Power Output – Bridged Mode (0.1% THD)
1000 watts x 1, 8 Ω
Bridged 4 Ω operation is not recommended

Power measurement are at 120 VAC:
0.1% THD, RMS continuous power,
full audio band (20 Hz - 20 kHz)

Current Capacity
60 amps peak, per channel

Slew Rate
> 130 volts per microsecond

Frequency Response
5 Hz - 100 kHz, +0/-3 dB
20 Hz - 20 kHz, +0/-0.25 dB

Total Harmonic Distortion (THD)
< 0.1 % at full power
< 0.03 % at typical listening levels

IM Distortion
< 0.04 %

TIM
Unmeasurable

Inter-channel Crosstalk
> 80 dB at 1 kHz
> 70 dB at 20 kHz

Input Impedance
Unbalanced: 33 kΩ 
Balanced: 66 kΩ,(33 kΩ per leg)

Total Gain
29 dB

Input Sensitivity for 28.28 V Output into 8 Ω
Unbalanced: 1 V
Balanced: 1 V per leg

S/N Ratio
> 115 dB, input shorted, IHF A-weighted
> 110 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: 17-5/8" (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)

Net Weight
71 lb. (32.2 kg)

Shipping Weight
88 lb. (39.9 kg)

Power Requirement
Standby: 1 Watt
Idle (no music playing): 160 Watts 
Typical Listening levels: 300 Watts
Maximum: 1400 Watts

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