Radial JPC Computer Direct Box

The JPC is an analog stereo interface designed to help solve the hum and buzz problems commonly associated with connecting a computer or consumer playback device to an audio system.

The JPC is a stereo direct box that is easy to use with practically any consumer electronic device. It utilizes active buffers and transformer isolation to create a hybrid circuit that blocks ground loops and reduces system noise, along with AC blocking capacitors to prevent any audio system noise from bleeding back into the computer. The choice of ¼", RCA and 3.5mm input connectors make it easy to interface with all types of unbalanced audio sources such as computers, smartphones, and tablets, and the outputs are XLR balanced mic level to feed snake systems and PAs. Powering the JPC is accomplished via 48V phantom from a mixing console, allowing the JPC to be used in concert environments without requiring an external power supply.

Radial JPC Features

• Easy to use stereo interface for laptop computers
• Active signal path with transformer isolation
• Eliminates hum and buzz common to PCs
• Multiple connector types for any audio source
• Input pad, Ground lift, Phantom Power

• JPC Computer Direct Box1
• Three Year Warranty, transferable1

• Audio circuit type Unity Gain buffers and inverters using low noise high end audio grade operational amplifiers
• Number of channels 2
• Frequency response 20Hz ~ 20kHz +/- 2dB
• Dynamic range 111dB
• Total harmonic distortion 0.01% @ -15dBu Output
• Intermodulation Distortion Less than 0.15% at any level below clipping
• Phase Deviation +29º at 20Hz | -5º at 1kHz | -80º at 20kHz
• Input Impedance 10kΩ
• Output Impedance 600Ω
• Equivalent Input Noise -94dBu
• Noise -97dB below 0dB Out
• Maximum Input +17dBu
• Input Connectors 1/4", RCA, 3.5mm TRS
• Output Connectors XLR
• Construction 14 gauge steel chassis and outer shell
• Dimensions (LxWxD) 3.3x5x2" (84x127x48mm)
• Weight 1.55lb (720 g)
• Power 48V Phantom Power (each channel requirers 48V phantom)
• Conditions For use in dry locations only between 5°C and 40°C