Halo JC 3+ - Amplifier Parasound - Free user manual and instructions
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| Product Type | Phono Preamplifier (Phono Stage) |
| Brand | Parasound |
| Model | Halo JC 3+ |
| Dimensions (W x H x D) | 17.25 x 4.0 x 14.0 inches (438 x 102 x 356 mm) |
| Weight | 15.0 lbs (6.8 kg) |
| Power Supply | Internal linear transformer with separate analog stages |
| Inputs | 1 pair RCA (MM/MC selectable), 1 pair XLR (balanced MC) |
| Outputs | 1 pair RCA, 1 pair XLR (balanced), gain selectable |
| Gain Settings | MM: 40 dB, 50 dB; MC: 60 dB, 66 dB |
| RIAA Accuracy | ±0.2 dB (20 Hz – 20 kHz) |
| Subsonic Filter | Switchable, -3 dB at 15 Hz (12 dB/octave) |
| Signal-to-Noise Ratio | >80 dB (MM), >70 dB (MC) A-weighted |
| THD+N | <0.01% (MM), <0.05% (MC) |
| Cartridge Loading | Adjustable via internal DIP switches (resistive and capacitive) |
| Construction | Dual-mono design, gold-plated RCA jacks, Neutrik XLRs |
| Maintenance & Cleaning | Use a soft, dry cloth; avoid liquids; no user-serviceable parts inside |
| Safety Warnings | Operate in well-ventilated area; do not expose to moisture; unplug before cleaning |
| Spare Parts & Repairability | Contact Parasound or authorized service centers; no user-replaceable fuses |
Frequently Asked Questions - Halo JC 3+ Parasound
How do I set the gain for my moving magnet (MM) cartridge?
Set the rear panel gain switch to 40 dB for standard MM cartridges, or 50 dB for low-output MM cartridges. Adjust as needed to avoid distortion.
Can I connect both RCA and XLR outputs simultaneously?
Yes, both outputs are active simultaneously, but using both may cause ground loops. It is recommended to use only one output type at a time.
How do I adjust cartridge loading (resistive and capacitive)?
Open the top cover by removing screws, then locate the DIP switches on the phono board. Refer to the manual for exact switch positions. Typical settings: resistive 47kΩ, 100Ω, etc.; capacitive 100pF, 200pF, etc.
What is the subsonic filter for and should I use it?
The subsonic filter removes low-frequency rumble below 15 Hz, which can cause woofer flutter. Enable it for problematic records or turntables with motor rumble.
Is the JC 3+ compatible with low-output moving coil cartridges?
Yes, it offers MC gain of 60 dB or 66 dB and adjustable loading, suitable for virtually all MC cartridges.
How do I switch between MM and MC mode?
Use the front panel switch labeled Input to select MM or MC. The corresponding gain settings are automatically engaged based on the switch position.
Can I use this phono preamp with a moving iron cartridge?
Yes, moving iron cartridges work best in MM mode (40–50 dB gain) with standard 47kΩ loading. Adjust as necessary.
What is the recommended cleaning procedure for the chassis?
Use a soft, lint-free cloth slightly dampened with water or mild detergent. Avoid abrasive cleaners. Never spray directly onto the unit.
Does the JC 3+ have a mono switch?
No, the JC 3+ does not have a built-in mono switch. For mono playback, use a dedicated phono phase switch or a Y-cable.
What should I do if the unit is not powering on?
Check the power cord connection and ensure the rocker switch on the rear is set to ON. Verify your wall outlet is live. If still off, contact Parasound support; there is no user-serviceable fuse.
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