Parasound A23+ 2 Channel 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

All 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

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