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J48 Specifications

The Radial J48 has gained a tremendous following through the professional audio community. With significantly more headroom, lower distortion and unmatched durability, it is no wonder that the J48 has become the most specified direct box on stages around the world. As you will note with the specifications below, the J48 is exceptionally linear when tested both under laboratory conditions and when placed under the extra stress of 100 meters (300 feet) of cable. In the lab, the high frequency response actually exceeds 40kHz! This makes the J48 a perfect candidate for the most demanding studio recording while being the obvious choice for the artist on stage.

Blue Report

In effort to provide the more discerning audio engineer with all of the technical support materials to make a proper and informed decision, we have produced the Radial Blue Report. This provides in-depth distortion tests and analysis of four popular direct boxes.

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Specifications
Audio circuit type: Proprietary analog circuit with low-noise op-amp
Frequency response: 20Hz ~ 20kHz
Dynamic range: 109dB
Total harmonic distortion: 0.002% @ -5dBu
Intermodulation Distortion: 0.003% @ -3dBu
Phase Deviation: +10º at 20Hz | 0º at 1kHz | -1º at 20kHz
Input Impedance: 220kΩ - ¼" input
Output Impedance: 200Ω - XLR output
Equivalent Input Noise: -103dBu
Noise: -99dB below 0dBu
Maximum Input: +10dBu
Features
Input pad, Mono Sum, 180° polarity reverse, Ground lift, HPF
Input Connectors: 1/4"
Output Connectors: Balanced XLR, 1/4" Thru
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: 1.55 lb (720 g)
Power: 48V phantom - proprietary digital switching
Conditions: For use in dry locations only between 5°C and 40°C
Warranty: Radial 3-year, transferable

Frequency Response

What do these graphs mean? Learn what to look for and why it matters.

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J48 Resources

Part no: R800 3001 00