Parasound HALO A23+ Power Amp Silver

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 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 Specs 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) Shipping Weight 34 lb. (14.4 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