The Halo A 23+ power amplifier combines exceptional power and performance. With two channels delivering 125 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 A 23+ power amplifier.- Two channels @ 125 watts per channel @ 8 Ω

- High bias Class A/AB operation

- Stable into 2 Ω loads

- Direct-coupled without capacitors in the signal path

- Balanced XLR and unbalanced RCA inputs

- A/B speaker terminals

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 aluminium 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 black

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 measurement 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)
• Power Requirement: Standby: <1 Watt, Idle (no music playing): 75 Watts, Typical Listening levels: 125 Watts, Maximum: 800 Watts, 110-125 VAC 60 Hz or 220-250 VAC 50 Hz (AC mains voltage is set on rear panel)