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Parasound Halo JC 1+ Mono Power Amplifier
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Parasound Halo JC 1+ Mono Power AmplifierParasound Halo JC 1+ Mono Power AmplifierParasound Halo JC 1+ Mono Power Amplifier
Parasound Halo JC 1+ Mono Power AmplifierParasound Halo JC 1+ Mono Power Amplifier

Parasound Halo JC 1+ Mono Power Amplifier

£8,999.00    
£7,499.17 Exc. VAT |  
  

|
  

Parasound Halo JC 1+ Mono Power Amplifier

 

The origin of the JC 1+

An audio historian could make a persuasive case that our new Parasound Halo JC  1+ is the most ambitious and extraordinary achievement since I stablished the Parasound brand in September 1981.

For almost 40 years our mission has remained the same: build audio components that sound better, measure betterand last longer than our competition, at prices that are sensible. We call this “value engineering.” It challenges us and guides every decision we make for every product we build.

The origins of the JC 1+ go back to 1989 when we engaged the legendary John Curl to design our power amplifiers. These were very successful, so in 2000 we commissioned Curl to develop the JC 1. Released in early 2003, the JC 1 immediately earned the respect and admiration of reviewers and audiophiles 
alike. It set new standards of performance and  value that were unrivaled during its 16 years in production. In fact, the last JC 1 to come off the production line
sounded just like the first JC 1. There were no “improved” versions during its entire product life -- simply because the JC 1 design, development, and manufacture made it so far ahead of its time.

A few years after the JC 1’s introduction, consumers and dealers began asking when we planned to build an improved JC 1. After all, this is a common practice in the audio industry (which makes me wonder, why couldn’t they get it right in the first place?).  My reply was always the same: “We could make changes to increase its price, but none that would materially improve performance.  Yes, we could make a more expensive JC 1 and, if we were lucky, it might sound as good as the existing JC 1.

In early 2014, John Curl announced that he was investigating ideas that could substantially improve the JC 1 performance. As all Curl’s theories are based on
objective science, not wishful thinking or self-suggestion, I was all ears. It’s prudent to be skeptical of new ideas, and we were.  So Parasound hand-built six experimental prototypes to test Curl’s theories. What we measured and heard were nothing short of astonishing.

The JC 1+ decisively outperformed the JC 1 in every respect.

New insights

Most amplifier manufacturers don’t allocate resources to develop their input and driver stages because they either fail to understand their critical role or they just don’t want to spend the money. Curl, on the other hand, knows that an amplifier can only be as good as its input stage. Input and driver stages that provide the amplifier’s voltage gain have a significant influence on an amplifier’s performance. If an amplifier’s input and driver stages are even slightly deficient, the very best output stage cannot make up for its shortcomings. Such an amplifier won’t meet our standards.

Curl addressed the most prevalent shortcomings of amplifier input stages.   First among these is distortion that originates in the input stage. Even the slightest amount of input stage distortion becomes significant by the time it reaches the amplifier’s output stage and ultimately, your speakers.

Input stage distortion is often caused by insufficient power supply voltage.  Any amplifier will distort if its input and driver stage B+ and B- power supply rail voltage “sags”. Yet in virtually all  amplifiers, the input stage power supply is shared with the output stage supply.  Typical input stages and driver stages derive their operating voltage from the output
stage power supply. This invites distortion whenever the amplifier is played at  high volume.

Voltage drops occur when the power transformer, bridge diodes and filter capacitors aren’t substantial. The original

JC 1 avoided voltages drops by equipping its power transformer with additional secondary windings solely for the input and driver stage power supply.

The Halo JC 1+ goes a step further with the addition of a separate power transformer dedicated to the input and driver stages. This second power transformer supplies ± 89V to high-speed  soft-recovery bridge diodes and Nichicon filter capacitors totaling 22,400uF, resulting in rock-solid ±112Vdc for the B+ and B- 
“rails” when the amplifier’s output stage is operating at its maximum capacity.

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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