Parasound Halo JC1+ Mono Power Amplifier

A 450 W, ultra-high-bias class A and AB amp designed by John Curl.

With circuitry designed by the legendary John Curl, the flagship Parasound Halo JC1+ is a world-class reference quality power amp. It offers 25 W of class-A power before switching (if ever needed) into class AB operation. A new John Curl driver stage employs a cascode circuit for greater open-loop bandwidth and superior linearity.

Parasound’s Bybee Music Rails offer active high-frequency filtration for the input stage. Gain can be set to 29 dB or 23 dB gain for optimum compatibility with high-gain preamps or extremely efficient speakers.

A separate R-core transformer for the input stage suppresses noise on the power line. The 22,400 uF input stage power supply filter capacitors are independent of the main power supply. There are six massive 33,000 uF Nichicon Gold Tune filter capacitors for the output stage. 

The direct coupled signal path means no capacitors or inductors get in the way of great sound. The JFET input stage is connected to a MOSFET driver stage, and the amp uses 24 beta-matched 15 ampere, 60 MHz bipolar output transistors. The 83 lb. amp uses a 2.1 kVA shielded toroidal transformer with a premium H18 grade core. There are independent power supplies for the input, driver, and output stages. The output stage uses 108,000 µF filter capacitors. Harris hyper-fast soft-recovery bridge diode rectifiers and REL & Nichicon Muse capacitors continue the theme of expensive, overspecified design that results in a sound with huge power and headroom. Full power is rated all the way down to 2 Hz for unrestricted low-end bass

Features

• DC Servo and 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 included

Specifications

Power Output (8, 4, 2 ohm): 450 W, 850 W, 1,300 W

Inputs: Stereo RCA, stereo XLR, DC trigger

Input Impedance: 100 kΩ

Gain: 23, 29 dB

Dimensions (WHD): 17-5/8″ x 7-1/8″ x 20″

Weight: 83 lb.