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.

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

Hybrid circuit for low noise

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.

JPC Applications

Using the JPC with a computer

Computers are often the cause of noise in the PA system. The JPC's combination of transformer isolation with an active drive circuit helps reduce noise by eliminating stray currents.

Using the JPC with a DJ setup

The JPC is well suited to handle the type of audio generated by CDs and digital audio files. By isolating the the source with the PA system you also eliminate noisy ground loops.

Using the JPC with a Phone

The JPC's 3.5mm (1/8") TRS jack makes it easy to interface portable playback devices. This makes it easy to bring unbalanced audio tracks into the PA system via the balanced mic input of a console.

Specifications

The JPC is a stereo consumer to mic level interface that 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 balanced professional audio equipment. As with all Radial products, tremendous attention has been paid to quality construction and delivering exceptional audio performance while eliminating noise.

• 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 Floor: -97dB below 0dB Out
• Maximum Input: +17dBu

Features

• Input pad, Ground lift, Phantom Power
• Input Connectors: 1/4", RCA, 3.5mm TRS
• Output Connectors: XLR

General

• Construction: 14 gauge steel chassis and outer shell
• Size (L x W x D): 3.3" x 5.0" x 2" (84 x 127 x 48mm)
• 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
• Warranty: Radial 3-year, transferable