Description
Parasound A21+ Halo – Audiophile Stereo Power Amplifier
Changes from the original A 21A 21+
- 250 300 Watts (8)
- 400 500 Watts (4)
- 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
All Features
- 300 watts x 2 @ 8 RMS, both channels driven
- 500 watts x 2 @ 4 RMS, both channels driven
- 1000 watts x 1 @ 8 , in bridged mode
- Circuitry designed by legendary John Curl
- High bias Class A/AB operation
- 60 amperes peak current per channel
- Stable with speaker impedance dips to 1.5
- Balanced inputs with discrete circuits
- CHK Infinium, custom 5-way speaker binding posts
- Gold-plated RCA input & loop output jacks
- Direct-coupled signal path, no capacitors or inductors
- DC Servo and relay protection circuits
- AC turn-on inrush surge protection with relay bypass
- JFET input stage, MOSFET driver stage
- 16 beta-matched 15 ampere, 60 MHz bipolar output transistors
- 1.3 kVA shielded toroid transformer w/ independent windings for each channel
- Independent power supplies for input stage, driver stage and output stage
- 108,000 F filter capacitors for output stages
- Full power is rated all the way down to 5Hz for unrestricted low-end bass
- Harris hyper-fast soft-recovery bridge diode rectifiers
- Automatic turn-on by 12 V trigger or audio sensing
- 4 rack space chassis with rear carry handles
- Rack mount hardware is included
- Available in silver or black
Technical Specifications :
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Power Output –Stereo Mode (0.1% THD) |
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Power Output – Bridged Mode (0.1% THD) |
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Power measurements parameters with 120VAC |
0.1% THD, RMS continuous power, full audio band (20 Hz – 20 kHz) |
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Current Capacity: |
60 amps peak, per channel |
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Slew Rate |
> 130 volts per microsecond |
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Frequency Response |
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Total Harmonic Distortion (THD) |
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Interchannel Crosstalk |
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Input Impedance |
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Input Sensitivity for 28.28 V Output into 8 |
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S/N Ratio |
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Damping Factor |
> 1100 at 20 Hz |
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DC Trigger Requirements |
+9 Vdc to +12 Vdc, 5 mA |
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Audio Trigger Requirements |
2 mV – 10 mV |
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XLR Pin Identification |
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Dimensions |
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Weight |
39.9Kg |
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Power Requirement |
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IM Distortion |
< 0.04 % |
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Total Gain |
29 dB |
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