Parasound Halo A21+ Stereo Power Amplifier
Changes from the original A 21 A 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
Specs
Power Output Stereo Mode (0.1% THD)
300 watts x 2, 8 both channels driven
500 watts x 2, 4 both channels driven
Power Output Bridged Mode (0.1% THD)
1000 watts x 1, 8
Bridged 4 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 k
Balanced: 66 k ,(33 k per leg)
Total Gain
29 dB
Input Sensitivity for 28.28 V Output into 8
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
