Parasound JC 1+ Mono Power Amplifier

Product description

Changes from the JC 1 to JC 1+

400 → 450 Watts @ 8Ω

800 → 850 Watts @ 4Ω

1200 → 1300 Watts @ 2Ω

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

Features

- 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

Parasound JC1+ Mono Amplifier User's Manual

Specifications

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

Current Capacity: 180 amps, peak

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 kΩ 
Balanced: 100 kΩ, (50 kΩ 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 Ω 
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

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