Radial J48

The J48™ is an active direct box that has been optimized to handle extreme transients without distortion, with a linear frequency response that extends from 20Hz up to 40kHz.

• Exceptional headroom & dynamic range

• Retains the natural sound of the instrument

• Merge switch sums stereo instruments to mono

• Powered by 48V phantom, no batteries required

Higher Rail Voltage, Higher Headroom
Most battery-powered guitars and basses will produce as much as 7 Volts when played at maximum volume, which can easily overload typical active direct boxes which have are only able to handle about 3 Volts. The J48 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.

FEATURES

15dB Pad
Reduces the input sensitivity for active basses and high output keyboards.

48V Check
Flashes once when the 80Hz filter is depressed to confirm 48V  phantom power is present.

Merge
Changes the input and thru-put to two LR inputs and mixes the output to mono at the XLR.

Input
Instrument input  connection to the J48.

Thru
Throughput from the J48 to the amp. Hi impedance will not load instrument down.

XLR Output
Balanced 600Ω mic level output, use to feed mixer  or mic preamp.

180°
Polarity reverse use to correct the phase on old gear and reduce feedback on stage.

Low Cut
80Hz high pass filter cleans up bottom end and reduces resonant feedback.

Lift
Ground lift switch disconnects the ground from the audio signal path and help eliminate hum and buzz caused by ground loops.

Glass-Filled
Nylon XLR connector with extra large nickel-silver pin contacts. Tougher than steel!

Active Circuit
Combination discrete & IC circuitry for exceptional signal handling & low noise.

Internal Switching Supply
Increases rail voltage for more headroom and lower distortion.

Ground Lift
Located inside the J48 circuitry (not at the XLR) to ensure phantom power isn’t dropped when the switch is engaged.

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
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