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JC 1+ Mono Power Amplifier by John Curl

Parasound JC1
Halo Collection

Quick Specs

  • Type: Amplifier
  • Width: 17 1/4"
  • Height: 7 5/8"
  • Depth: 20"
  • Energy Star Rated: No

This item has purchase restrictions.

We currently only offer this product for purchase within 150 miles of our store. Questions? Contact us for more information.

Changes from the JC 1 to JC 1+

Read the JC 1+ development story here

  • 400 450 Watts @ 8
  • 800 850 Watts @ 4
  • 1200 1300 Watts @ 2
  • Filter capacitance: 132,000 198,000 uF
  • Transformer capacity: 1.9 2.1 kVA
  • Output transistors: 18 24 Sanken 60Mz devices
  • Peak current: 135 180 amps
  • Weight: 64 83 lbs net
  • Bybee Music Rails™ active high frequency noise filters
  • John Curl driver stage employs a new cascode circuit design
  • FR-408 input circuit board material improves HF signal integrity
  • Gain switch to select 29 dB or 23 dB of gain
  • R-core power transformer for input stage
  • Input circuit board is shielded
  • Double thickness copper on output/power supply circuit boards
  • Gold-plated internal audio signal path connectors
  • Custom CHK Infinium speaker binding posts
  • Looping Neutrik XLR output for easier bi-amping
  • Front panel power indicator LED
  • Updated auto turn on circuits with 3.5mm 12V trigger jacks
  • 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 1
  • 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
Power Output 450 x1 watts @ 8
850 x1 watts @ 4
1300 x1 watts @ 2
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
Current Capacity 180 amps, peak
Slew Rate > 130 volts per microsecond Slew Rate > 130 volts per microsecond
Frequency Response 2 Hz - 120 kHz, +0/-2 dB
20 Hz - 20 kHz, +0/-0.25 dB
Total Harmonic Distortion (THD) < 0.15 % at full power
< 0.02 % at typical listening levels
IM Distortion < 0.03 %
TIM Unmeasurable
Damping Factor > 1200 at 20 Hz
Input Impedance Unbalanced: 50 k
Balanced: 100 k , (50 k per leg)
S/N Ratio, inputs shorted >122 dB, IHF A-weighted, bias set to Low
>120 dB, IHF A-weighted, bias set to High
>113 dB, Unweighted, bias set to Low
>111 dB, Unweighted, bias set to High
Total Gain 29 dB (Gain switch set to normal)
23 dB (Gain switch set to low)
Input Sensitivity for 28.28 V Output into 8 Unbalanced: 1 V
Balanced: 1 V per leg
(Gain switch set to normal)
DC Trigger Requirements +9 Vdc to +12 Vdc, 5 mA
Audio Trigger Requirement 2.5 mV - 10 mV
XLR Pin Identification 1 = Ground (Shield)
2 = Positive
3 = Negative (Return)
Dimensions Height without feet: 7-1/8" (181 mm)
Height with feet: 7-3/4" (197 mm)
Depth: 20" (508 mm)
Depth with cables: 21-1/2" (546 mm)
Shipping Carton Dimensions Width: 29-1/2" (750 mm)
Depth: 27-1/2" (700 mm)
Height: 15-3/4" (400 mm)
Net Weight 83 lb. (37.6 kg)
Shipping Weight 107 lb. (48.5 kg)
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

Quick Specs

  • Appearance

  • Type: Amplifier

  • Dimensions

  • Width: 17 1/4"
  • Height: 7 5/8"
  • Depth: 20"

  • Features

  • Energy Star Rated: No

JC 1+ Owner's Manual

Spade Terminal Compatibility

Halo 4U Chassis and Foot Dimensions

Parasound Amp BTU Ratings

The JC 1+ Development Story

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