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PARASOUND HALO JC 1+ Mono Power Amplifier by John Curl


Power Output
450 x1 watts @ 8 Ω
850 x1 watts @ 4 Ω
1300 x1 watts @ 2 Ω

Power measurements are with 120 VAC:
0.15% THD, RMS continuous power,
full audio band (20 Hz – 20 kHz)

Class A Power Output
25 Watts, bias switch set to high
10 Watts, bias switch set to low

Power Requirement
Standby: <1 Watt
Idle (bias set to low): 145 Watts
Idle (bias set to high): 275 Watts
Typical Listening levels: 400 Watts
Maximum: 1500 Watts

Contact us for availability
Limited quantities may be available.

Available on backorder


  • Circuitry designed by legendary John Curl
  • Ultra-high bias Class A/AB operation
  • 25 watts of pure Class A power
  • Stable with speaker impedance dips below 1Ω
  • Bybee Music Rails™ – active high frequency filters for input stage
  • New John Curl driver stage employs a cascode circuit for greater open loop bandwidth & superior linearity
  • Gain switch to select 29 dB or 23 dB gain for optimum compatibility with high gain preamps or extremely efficient speakers
  • R-core transformer for input stage suppresses noise on power line
  • 6 massive 33,000 uF Nichicon Gold Tune filter capacitors for output stage
  • 22,400 uF input stage power supply filter capacitors, independent of the main power supply
  • Dual CHK Infinium, custom 5-way speaker binding posts for easy bi-wiring
  • Neutrik locking XLR balanced input & loop output jacks
  • Vampire 24k gold-plated RCA input & loop output jacks
  • Direct-coupled signal path, no capacitors or inductors in the audio path
  • JFET input stage, MOSFET driver stage
  • 24 beta-matched 15 ampere, 230V, 60 MHz bipolar output transistors
  • 2.1 kVA shielded toroid power transformer with premium H18 grade core
  • Independent power supplies for input stage, driver stage & output stage
  • Full power is rated all the way down to 2Hz for unrestricted low-end bass
  • Harris hyper-fast soft-recovery bridge diode rectifiers
  • REL & Nichicon Muse capacitors
  • DC servo & relay protection circuits
  • AC turn-on inrush surge protection with relay bypass
  • Automatic turn-on by 12 V trigger or audio sensing
  • 4 rack space chassis with rear carry handles
  • Rack mount hardware is included
  • Available in silver or black
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