Parasound Halo A23+
The Halo A23+ stereo amplifier combines exceptional power and performance. With two channels delivering 160 watts per channel into 8 Ω, it offers a compelling audio experience. The high bias Class A/AB operation ensures accurate and detailed sound reproduction. Its stable operation into 2 Ω loads provides flexibility for various speaker configurations. The direct-coupled design, free from capacitors in the signal path, maintains signal purity and enhances transparency. With balanced XLR and unbalanced RCA inputs and A/B speaker terminals, it offers versatility and compatibility. Experience exceptional power and performance with the Halo A23+ power amplifier.
Changes from the original A 23→A 23+
- 125 → 160 Watts (8Ω)
- 225 → 240 Watts (4Ω)
- 400 → 500 Watts (bridged)
- Filter cap: 40,000 uF →54,400 uF
- Crosstalk (20kHz): 63dB → 70dB
- Transformer size: 1.0 kVA → 1.1 kVA
- Refined Halo cosmetic with aluminum end caps & gold highlights
- Updated rear panel with heavy duty speaker terminals from HINT 6
- Upgraded internal gold on gold audio connections
- Updated auto turn on circuit
Features
- 160 watts x 2 @ 8 Ω RMS, both channels driven
- 240 watts x 2 @ 4 Ω RMS, both channels driven
- 500 watts x 1 @ 8 Ω, in bridged mode
- Circuitry designed by legendary John Curl
- High bias Class A/AB operation
- 45 amperes peak current per channel
- Stable with speaker impedance dips below 2 Ω
- Balanced inputs with discrete circuits
- Heavy-duty 24k gold-plated 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
- 12 beta-matched 15 ampere, 60 MHz bipolar output transistors
- 1.1 kVA shielded toroid transformer w/ independent windings for each channel
- Independent power supplies for input stage, driver stage and output stage
- 54,400 µF 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
- 2 rack space chassis with rear carry handles
- Rack mount hardware available separately
- Available in silver or black
Specifications
| Amplifier Specifications | |
|---|---|
| Power Output – Stereo Mode (0.06% THD) | 160 watts x 2, 8 Ω both channels driven 240 watts x 2, 4 Ω both channels driven |
| Power Output – Stereo Mode (0.9% THD) | 210 watts x 2, 8 Ω both channels driven 300 watts x 2, 4 Ω both channels driven |
| Power Output – Bridged Mode (0.06% THD) | 500 watts x 1, 8 Ω Bridged 4 Ω operation is not recommended |
| Power Output – Bridged Mode (0.9% THD) | 600 watts x 1, 8 Ω Bridged 4 Ω operation is not recommended *All Power measurements are at 120 VAC, RMS continuous power, full audio band (20 Hz - 20 kHz) |
| Current Capacity | 45 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) | < 0.06 % at full power < 0.03 % at typical listening levels |
| IM Distortion | < 0.04 % |
| TIM | Unmeasurable |
| Inter-channel Crosstalk | > 85 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 Out (8 Ω Load) | Unbalanced: 1 V Balanced: 1 V per leg |
| S/N Ratio | > 112 dB, input shorted, IHF A-weighted > 107 dB, input shorted, unweighted |
| Damping Factor | > 800 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: 17-1/4" (437 mm) Depth: 15-1/4" (388 mm) Depth with cables: 17" (432 mm) Height with feet: 4-1/8" (105 mm) Height without feet: 3-1/2" (89 mm), 2U |
| Net Weight | 27 lb. (12.2 kg) |
| Shipping Weight | 34 lb. (14.4 kg) |
| Power Requirement |
Standby: < 1 Watt Idle (no music): 75 Watts Typical Listening: 125 Watts Maximum: 800 Watts 110-125 VAC 60 Hz or 220-250 VAC 50 Hz AC mains voltage is set on rear panel |
Parasound Reviews
Parasound Halo A23+
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