Description
Phantom Powered Stereo Active Direct Box
The J48™ is a two channel 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.
 | Features
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Higher voltage, higher headroomMost 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. |  |
J48 Stereo Applications
 Using the J48 Stereo with a keyboardThe 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. |  Using the J48 Stereo with two bassesThe compact design makes it easy to connect two guitars using one direct box. The great sounding active circuit sounds as good as other DIs costing five times as much! |  J48 Stereo with two different instrumentsUse the J48 Stereo with two completely different instruments. The low crosstalk makes it a great choice when doubling between bass, acoustic guitar, fiddle, or mandolin. |
To meet the requirements of California Proposition 65, it is our responsibility to inform you of the following:
WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.
Please take proper care when handling and consult local government regulations before discarding.
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 and there is no doubt that the J48 Stereo will follow suit. As you will note, the J48 Stereo is exceptionally linear with a frequency response that exceeds 40kHz. Just as impressive, it produces a wonderful cascade of even order harmonics reminiscent of the finest studio equipment. Amazing signal handling, great sound and low noise… The J48 Stereo rules!
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: -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
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
Block Diagram
Graphs
Frequency Response |
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 Fast Fourier Transform |
 High Pass Filter On |
 IMD vs Output |
 Noise Spectrum |
 Phase Response |
 Distortion vs Output |
 Distortion vs Output |
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