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Parasound JC 1+ Mono Power Amplifier (STORE DEMO PAIR)

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RRP:
$18,998.00
Your Price:
$15,999.97 (You save $2,998.03)
SKU:
PARJC1PLUSSD
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  • Product Description

    STORE DEMO PAIR - MINT CONDITION - FULL WARRANTY

    One channel to rule them all
    Parasound's monolithic 83-pound JC 1+ can kick out the jams with absolute authority. It delivers a whopping 450 watts into a single channel at 8 ohms, and it's stable down to 2 ohms, offering flexibility to drive even the most demanding speakers.
    The company's famed audio guru John Curl spent five years developing this amp as an upgrade to his original JC 1, which has been wowing audiophiles since 2003. He redesigned the input stages with an independent power supply for increased output with minimal distortion.

    Parasound's audio guru John Curl chose the parts for the JC 1+ and laid out its circuit pathways to ensure high power with minimal distortion.
    Class A/AB operation for smoother sound
    the JC 1+ uses Class A/AB amplifier technology, which we don't see every day. So let's talk about what that means.
    Engineers and audiophiles generally agree that Class A designs offer the purest sound, but they tend to run hot and take up a lot of space. As a result, home audio amplifiers often use a compromise known as Class AB, which hands off part of the audio signal to a different set of output transistors at high power levels. AB can sacrifice a bit of signal purity, but it lets the amp run cooler and more efficiently.
    So this Class A/AB amp operates in pure Class A mode up to a higher power level than most other amplifiers in its price category, before the second set of transistors kick in. The result is a sound that's smoother, less fatiguing, and more natural. This amp includes a bias switch that can be set to "low" to reduce heat output and power consumption. When it's set to "high," the amplifier delivers up to 25 watts of pure Class A power.
    Convenient connections
    On the back panel are single balanced mono XLR and unbalanced mono RCA input and output with switchable gain. There are also a pair of speaker binding posts, with the second pair allowing easy bi-wiring. The amp can be rack mounted using the included ears.
    The legacy of John Curl
    As noted above, the JC 1+ was designed by audio engineering mastermind John Curl — his signature appears on the front and back panels, as a matter of fact. Curl started his career in the 1970s, designing tape and video recorders at Ampex, and he had a hand in building the Grateful Dead's famous Wall of Sound. He has worked with Parasound since 1989, designing all of their high-power amplifiers and more. He chose this flagship amp's parts and laid out its circuit pathways to deliver no-holds-barred power and performance for audiophiles.

    Product highlights:

    • 450 watts into a single channel at 8 ohms (20-20,000 Hz) at 0.15% THD
    • 850 watts x 1 at 4 ohms
    • 1,300 watts x 1 at 2 ohms
    • designed by legendary audio engineer John Curl
    • Class A/AB amplifier design with Normal/Low bias switch
      • rated for up to 25 watts of pure Class A power in Normal mode
      • Low setting reduces heat output and power consumption
    • large custom toroidal transformer
    • separate R-core power transformer for input stage
    • Bybee Music Rails™ filter high frequency noise from the input stage
    • frequency response: 2-120,000 Hz (+0/-2dB)
    • signal-to-noise ratio: 122 dB (bias set to Low)
    • balanced XLR and unbalanced RCA input and output
    • switchable gain: Low +23 dB; Normal +29 dB
    • dual binding post speaker connectors enable bi-wiring of a single speaker
    • switchable turn-on options: manual, signal sensing, or 12-volt trigger
      • selectable turn-on delay (0, 4, 8 or 12 seconds)
    • detachable power cord
    • rack mounting ears included
    Dimensions and warranty:
    • 17-5/8"W x 7-3/4"H x 21-1/2"D (4U rack spaces)
    • weight: 83 lbs.
    • warranty: 5 years
    • MFR # JC 1 + BLACK

    What's in the box:

    • Mono power amplifier
    • 6' AC power cord
    • 6' Mono-minijack cable
    • Rack-mount hardware
    • Owner's Guide

    Changes from the JC 1 to JC 1+

    • 400 → 450 Watts @ 8Ω
    • 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



    All 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

    Specs:

    • 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
    • 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)
    • Power Requirement:
    • Standby:
    • Idle (bias set to low): 145 Watts
    • Idle (bias set to high): 275 Watts
    • Typical Listening levels: 400 Watts
    • Typical Listening levels: 400 Watts
    • Dimensions (HD): 7-1/8" x 20"
    • Net Weight: 83 lbs.
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