Radial JPC 2-channel Active Instrument Direct Box

Stereo Direct Box for Computer Sound Cards & A/V
Radial JPC 2-channel Active Instrument Direct Box image 1
Radial JPC 2-channel Active Instrument Direct Box image 1
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Radial JPC 2-channel Active Instrument Direct Box
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A Smart DI for Sound Cards, AV Post and Electronic Media

The Radial JPC is a two-channel hybrid direct box designed to address the demand for interfacing computer sound cards, consumer electronics and other gear to professional sound systems. The JPC features two active 48V phantom powered channels in a compact, rugged enclosure. The JPC combines an active drive circuit, for long cable runs, with transformer isolated inputs to eliminate hum and buzz caused by ground loops.

Radial JPC at a Glance:
  • Stereo DI for computer sound cards & A/V.
  • Transformer isolation eliminates ground loops.
  • Converts -10db to balanced XLR mic level.
  • Active drive circuit for long cable runs.
  • Compact design - may be J-Rak mounted.
  • 48V phantom power eliminates batteries.
  • Ultra rugged 14-gauge steel construction.

Stereo PC/AV DI
The Radial JPC is a stereo direct box that has been specifically designed for use with computer sound cards and other consumer electronic products to allow these to be connected to a professional sound system. It is unique in that it combines the advantages of transformer-isolated inputs with an active drive circuit, giving you the 'best of both worlds' in a compact and extremely flexible package.

Isolation Eliminates Ground Loops
Transformer coupled inputs have the unique advantage of isolating the 'source' from the 'destination'. This proven approach eliminates 60-cycle hum and buzz caused by so-called ground loops when two pieces of electrically powered devices are connected together. Because the active circuit does all of the impedance conversion and balancing, a dedicated 1:1 transformer can be used. This results in a hybrid design that is at once great sounding, compact and more affordable.

48V Phantom Power
As with all great designs, simplicity is a fundamental trait and the Radial JPC certainly fits the bill. A choice of stereo 1/4", 1/8" and RCA input AND thru-put connectors make interfacing a snap with all types of equipment. A single switch inserts a -10dB pad, two power LEDs confirm 48V phantom is turned on, and a pair of XLR output connectors round out the feature set.

Ultra Rugged Construction
Of course like all Radial products, the JPC is built to handle any environment. The book-cover wrap-around sleeve design protects switches and connectors from damage while the 14 gauge steel I-beam construction eliminates stress that could torque the PC board and cause solder joint failure. A full-bottom no-slip pad provides electrical insulation and mechanical isolation with plenty of 'stay-put' for use on hectic stages. And with its baked enamel finish, the Radial JPC will continue looking great for years!

Radial JPC Features:
  • Isolated XLR connectors to eliminate chassis ground potential.
  • Active balanced circuit drives long cable runs without signal loss.
  • Audio Transformers on both inputs provide 100% isolation to eliminate hum and noise causing ground loops.
  • 14-Gauge steel welded I-beam construction makes it impossible to torque the PC board.
  • High grade switches - long life, high cycle for reliable performance.
  • Military spec PC board with full surface ground plane to reduce RF noise susceptibility.
  • A -10dB pad reduces the level going into the JPC from loud sources that could overload the circuit and cause distortion.
  • 48V Power on LEDs lets you know that phantom has been turned on and is powering the two channels.
  • 1/4" TRS connector that will also work with 1/4" mono instrument signals!
  • 1/8" TRS connector designed for PCs and laptops, makes connection easy with standard 1/8" to 1/8" cable.
  • Twin RCA connectors are great for connecting DVD/CD players and video machines. RCA thru-puts for flexibility.
  • Book-end design creates a protective zone around the switches & connectors - Indestructable 14-gauge steel construction.
  • Twin balanced XLR male output connectors; AES standard with Pin-1 ground and Pin-2 hot.
  • Full no-slip rubber bottom pad provides mechanical isolation, electrical insulation and 'stay-put-ability!'
  • Heavy-duty baked enamel finish for excellent durability and great looks for years!
  • Side mounted ground-lift disconnects the ground path to the transformer at the XLR output. This is used when a ground path is made at the input side such as with a computer or rack module.
The JPC offers a myriad of input connector options to simplify interfacing your computer, DVD/CD, MP3 player or other consumer audio device with the world of AES standard professional ballanced equipment. As with all Radial products, only the highest professional standards are used inside and out, in circuitry and construction.

Tech Specs

Type Active DI
Channels 2
Inputs 2 x 1/4", 1 x 1/8" stereo, 2 x RCA
Outputs 2 x XLR, 2 x RCA thru
Height 1.9"
Depth 5"
Width 3.3"
Weight 2.6 lbs.
Manufacturer Part Number R800 1026

Customer Reviews

Based on 1 review
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JPC is perfect

As long as I am using this DI to connect into a console (or any line that can feed +48v) I can get a clean signal for not only my iPod to play .wav files through FOH live, but I can use it to connect things like synths/keyboards/etc into a console to record or use live. I've done all of the above with this box since I purchased, and couldn't be happier with the results. Radial makes solid gear, no doubts here.
Music background: studio/live sound engineer
See also: Direct Input Boxes, Radial, Radial Direct Boxes