top of page



  • Designed by John Curl - creator of the legendary Vendetta Research phono preamp
  • Inputs and outputs use Vampire brand 24k gold-plated RCA jacks
  • Balanced outputs use Neutrik brand premium XLR jacks
  • MM 47k ohm, MC 47k ohm or MC variable 50-550 Ohms
  • RIAA accurate within 0.2 dB
  • Exclusively Vishay-Dale resistors in the audio path
  • Triple shielding; low-carbon mild steel partitions isolate the power supplies & AC wires
  • Dual mono design; each audio channel is separately enclosed in its own extruded aluminum enclosure
  • Separate high speed-soft recovery rectifiers, filter caps and voltage regulators for each channel
  • Mono switch can improve sound of mono and older LPs
  • Built-in AC line conditioner to prevent AC noise from polluting the circuits
  • AC polarity reverse switch can reduce hum in many systems
  • Non-magnetic aluminum rear panel for purest sound
  • Turn On Options switch: manual or auto with 12v trigger input
  • Premium detachable heavy gauge IEC AC cord
  • 2u Chassis, rack mountable with HRA2 (sold separately)



How the JC 3+ improves on the original JC 3:

  • Variable MC load adjust independent for each channel from 50-550 ohms with dual gang potentiometers specially made for Parasound by Vishay.
  • Curl-Thompson tweaked circuits to further reduce the JC 3 silent background noise.
  • 24k gold plated copper traces on phono module boards for utmost conductivity and most transparency/detail in the music.
  • 47% larger low ESD power supply filter caps greater reserve for head-snapping dynamics.
  • 82% larger R-core power transformer greater reserve for more low end impact.
  • Ability to turn off illumination of the front panel P logo.
  • Now Available in Silver or Black.

Parasound Halo JC 3+ Phono Preamplifier by John Curl

  • Frequency Response: 20 Hz - 20 kHz, +/- 0.2 dB 


    Total Harmonic Distortion: < 0.01% at 1 kHz


    Signal to Noise Ratio, MM
       > 87 dB, input shorted, IHF A-weighted
       > 78 dB, input shorted, unweighted


    Signal to Noise Ratio, MC
       > 87 dB, input shorted, IHF A-weighted
       > 67 dB, input shorted, unweighted


    Interchannel Crosstalk: 72 dB at 1 kHz


    Input Impedance
       MM: 47k Ω
       MC: 50 - 550 Ω variable, 47k Ω fixed


    Output Impedance
       Unbalanced: < 100 Ω
       Balanced: < 100 Ω per leg


    Input Capacitance: 150 pF


    Input Sensitivity at 1 kHz
       MM: 4mV for 1 V output
       MC: 600µV for 1 V output


    Total Gain
       MM: 48 dB
       MC: 64 dB


    XLR Pin Identification
       1 = Ground (Shield)
       2 = Positive
       3 = Negative (Return)


    AC Power RequirementStandby:  

       Standby: 1 watt
       Power On: 12 watts
       115 or 230 VAC 50 - 60 Hz
       (Selected on Chassis Bottom)


       Width: 17-1/4" 
       Height without feet: 3-1/2" 
       Height with feet: 4-1/8"  
       Depth: 13-3/4" 


    Net Weight: 19 lbs. (8.6 kg)


    Shipping Weight: 26 lbs. (11.8 kg)


bottom of page