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Parasound JC 1+ Mono Power Amplifier (Each)

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Parasound JC 1+ Mono power Amplifier – Creating an amplifier capable of eliciting the very best performance from the finest loudspeakers and outperforming even the highest-priced competition, makes the JC 1+ Parasound‘s most ambitious product undertaking to date. The Parasound design team once again enlisted legendary audio designer, John Curl, the “JC” behind the company’s critically acclaimed and multi-award-winning JC 1, JC 2BP, JC 3+, JC 3 Jr., and other no-compromise Halo components.

The JC 1+ is the culmination of five years of design, engineering, and rigorous testing. Significant innovations and advancements in the Halo JC 1+ make it superior to the JC 1 in every respect, and that’s no small accomplishment, considering the fact that the JC 1 is among the most highly acclaimed and popular amplifiers in audio history. With a power delivery of 450 watts RMS into 8 ohms, 850 watts RMS into 4 ohms, and 1,300 watts RMS into 2 ohms, supported by a peak current capability of 180 amperes, the JC 1+ elicits magnificent performance from the finest speakers. The first 25+ watts in pure class A will truly make your speakers sing. In fact, you don’t know how good your speakers can sound…yet.

Parasound’s Halo JC 1+ recently won the Best Monoblock Power Amplifier category in the Best Product 2020 Awards from Secrets of Home Theater and High Fidelity. “Parasound has long been admired for their preamplifiers and power amplifiers. The JC 1+ monoblock power amplifier is their latest achievement, and it truly is an achievement to the highest degree,” notes Editor-in-Chief John E. Johnson. “The sound is exemplary… Proof of Performance for the Parasound has been verified. They are worth the price.”


  • 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 black


  • 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: 
  • 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


“I’ve not heard any other monoblock entrant at or even close to this price that is able to recreate so many aspects of music with a more authentic voice. These amps are magnificent performers in nearly every regard,” raves Greg Weaver in his review for Positive Feedback online magazine. “Honestly, I cannot think of a pair of monoblocks that offer a view anywhere near this close to the top of the heap for anywhere near their asking price.”

Greg Weaver concludes, “I can tell you that if I were shopping for a pair of monoblocks under $25,000, the Parasound Halo JC 1+ would be my first choice. Go give these new over-achievers a listen and be prepared to be bowled over by what you will hear. Most enthusiastically recommended.”


The massively imposing original Parasound JC 1 is a behemoth of a no-nonsense, high-performance amplifier. The JC 1+ is even more impressive. Comparing the JC 1+ and the JC 1 by the numbers, the JC 1+ is 30% heavier, while its 2.1kVA main power transformer is 20% greater in weight, size, and electrical capacity. The main power supply filter capacity is 50% greater to support the most demanding music. And with 33% more Sanken 250V/15A/60Mz output transistors and 33% higher peak current, the JC 1+ reproduces music with unmatched authority.

In comparison to the JC 1, one attribute of the JC 1+ that you will notice immediately is its sonic refinement. While this isn’t a quality that you can visualize with test equipment, your ears, mind, and emotions will recognize and appreciate it right away.


Unique technology “firsts” endow the JC 1+ with enormous competitive advantages such as Bybee Music Rails™ in the input stage. Because even miniscule amounts of input stage noise will degrade sound quality, Curl specified the addition of Music Rails. These are sophisticated active B+ and B- high frequency filters that “scrub away” every last vestige of power supply noise. As a result, music reproduction is amazingly life-like and totally authentic to the source material.

The JC 1+’s input stage ± 112V power supply rails are totally independent from the main power supply. This banishes input stage distortion that occurs when the rail voltages sag. JC 1+ input stage voltage remains constant, no matter how hard its output stage is working. This averts a deficiency inherent in nearly every other amplifier. Additionally, the custom-built R-core transformer powering the input stage reduces pollution caused by noise carried on the AC power line.


No-compromise components have been used throughout the construction of the JC 1+. The JC 1+ is the first audio product to employ FR408, a superior circuit board material for optimum propagation of high frequencies for the most natural musical reproduction. Until now, FR408 was used primarily in super computers and aerospace electronics.

Furthering the outstanding sonic purity, the input-driver circuit board is well shielded from internal currents. Premium REL capacitors (now manufactured by Wilson Audio) use a proprietary design which “immunizes” them from micro vibrations that degrade the sound quality of other caps. The JC 1+ relies on 24k gold-on-gold internal connectors for the audio interconnects between the input/driver stage and output stage. This avoids oxidation, so that the audio signals remain pristine year after year.


A new wider open loop gain cascode driver stage in the JC 1+ achieves greater linearity. A “fast start” bias circuit enables the JC 1+ to sound its best within minutes after turn-on, while a bias level selector switch enables the JC 1+ to run cooler with virtually no compromise in performance. A two-position gain switch selects 23dB or 29dB gain to optimize performance with high gain preamps and high sensitivity speakers. Staggered turn-on delays enable you to automatically power up multiple JC 1+s one at a time to prevent your lights from dimming!

Premium Neutrik 24k gold-plated balanced locking XLR and Vampire unbalanced RCA output connectors facilitate bi-wiring. Parasound-designed propeller speaker terminals accept spade lugs up to 16mm wide, banana plugs, and 5-AWG bare speaker wire.




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