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.
Specifications
Block Diagram
Graphs
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 Floor: | -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 |
![](https://www.radialeng.com/wp-content/uploads/2018/04/j48-block-diagram.jpg)
Frequency Response
![](https://www.radialeng.com/wp-content/uploads/2018/04/j48-graph-freq-response-768x290.jpg)
What do these graphs mean? Learn what to look for and why it matters.
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