Radial J48 Stereo

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.

• Exceptional headroom & dynamic range

• Retains the natural sound of the instrument

• Use with stereo sources or multiple instruments

• Powered by 48V phantom, no batteries required

• Unbalanced 1/4" input jacks used to connect instruments to the J48 Stereo

• Thru-put from the J48 Stereo to a the amp. High impedance will not load instrument down

• 15dB Pad reduces the input sensitivity for active basses and high output keyboards

• 48V LED illuminates when 48V phantom power is present

• High pass filter reduces excessive low frequencies that can cause resonance and acoustic feedback on stage

• Balanced mic level outputs used to feed mixer or mic preamp

• Ground lift lifts the audio ground at the power supply to reduce hum and buzz caused by ground loops

• Polarity reverse used to correct the phase on old gear and reduce feedback on stage

Higher voltage, higher headroom
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 which have 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.

FEATURES

Inputs
Unbalanced 1/4" input jacks used to connect instruments to the J48 Stereo.

Thru
Thru-put from the J48 Stereo to the amp. High impedance will not load the instrument down.

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

48V LED
Illuminates when 48V phantom power is present.

HPF
High pass filter reduces excessive low frequencies that can cause resonance and acoustic feedback on stage.

XLR Outputs
Balanced mic level outputs used to feed mixer or mic preamp.

Ground Lift
Lifts the audio ground at the power supply to reduce hum and buzz caused by ground loops.

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

SPECIFICATIONS

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
Switches: 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
Warranty: Radial 3-year, transferable