Parasound Halo A23+ Stereo Power Amplifier by John Curl

  • $2,100.00


  • 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