PMT Audio
Radial Engineering J48 Stereo

Radial Engineering

J48 Stereo

DI Box

From Radial Engineering:

The J48 stereo is a high performance 2-channel active direct box for live concert touring and professional recording studio applications, with the ability to handle extreme transients without distortion while delivering the natural sound of your instrument.

Most battery-powered instruments and stereo keyboards will produce as much as 7 Volts when played at maximum volume, which can easily overload typical active direct boxes that are only able to handle about 3 Volts. The J48 Stereo uses a unique switching power supply that raises the internal rail voltage so it can handle up to an incredible 9 Volts, resulting in improved signal handling and greater headroom. This additional headroom significantly reduces distortion of all types, allowing the natural tone and character of the instrument to shine through. The J48 maintains stereo separation between the left and right channels, allowing it to be used on two separate instruments or with stereo sources such as keyboards.

The J48's active circuit and amazing signal handling makes it a great choice for both digital and old school analog keyboards. A built-in pad reduces the sensitivity if needed.

Specs

Audio circuit type
Proprietary analog circuit with low-noise op-amp
Number of channels
2
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
600Ω - XLR output
Equivalent input noise
-103dBu
Noise floor
-99dB below 0dBu
Maximum input
+10dBu
Features
Input pad, 180° polarity reverse, Ground lift, HPF
Input connectors
2x 1/4" in and thru
Output connectors
2x XLR
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

Source: Radial J48 Stereo specifications page