RADIAL / J48 Stereo

The J48 Stereo is a high-quality, two-channel active DI box. This is a stereo model of the J48, also used by Paul McCartney. Its built-in switching power supply converts 48V phantom power to DC/DC, providing ample headroom and low distortion. Its extremely flat frequency response from 10Hz to 40kHz ensures that even high-output instruments are not distorted.

■ Direct Box
■ Active
■ Stereo

■ Features
・Ultra-low distortion design
・Large headroom and wide dynamic range
・Reproduces the natural sound of your instrument
・Operates with 48V phantom power
・Made in Canada

■ PAD, HPF, Phase Reverse
The -15dB PAD reduces input sensitivity and prevents overload. The high-pass filter eliminates unwanted low-frequency and low-frequency resonances below 80Hz. The phase reverse switch on the side of the unit aligns the phase of the two pickups when using dual pickups and eliminates feedback that can occur in hot spots on stage.

■ GROUND LIFT Switch
When connecting a stage amplifier to a DI, ground loops can be a problem. This can cause hum and buzz in the sound due to power and voltage differences. A first solution is to float pin 1 (ground) of the XLR jack. However, with many active DIs, this also cuts off the phantom power, requiring the use of batteries or an external power source. However, instead of floating pin 1 of the XLR connector, the J48 does so through the power supply circuit. This eliminates noise issues while also providing phantom power.

■ Tough design for peace of mind on the job site
It's extremely tough and durable enough to withstand the rigors of professional use. The case is made from 14-gauge steel, and the unique bookend style with protruding edges around the switches provides excellent protection for the controls and switches. The internal frame is resistant to impacts and twisting, and uses a circuit board that is less likely to peel off the solder. All connectors are made from glass-fiber reinforced plastic and feature large, rust-resistant nickel-silver contacts.

■Specifications
Specifications are subject to change without notice.
Audio circuit type: Proprietary analog circuit with low-noise op-amp
Frequency response: 20Hz ~ 20kHz
Dynamic range: 109dB
Noise floor: -99dB below 0dBu
Equivalent input noise: -103dBu
Maximum input: +10dBu
Phase deviation: +10? at 20Hz | 0? at 1kHz | -1? at 20kHz
Total harmonic distortion: 0.002% @ -5dBu
Inter-modulation distortion: 0.003% @ -3dBu
Input impedance: 220k? - ?"" input
Output impedance: 600? - XLR output

■Features
Input connectors: Dual 1/4"" in and thru jacks
Input pad: -15dB
Polarity: 180? signal polarity reverse switch
High pass filter (HPF): -3dB @ 80Hz
Ground lift: Disconnects pin-1 at XLR output
XLR output: Follows AES standard (pin-2 hot)

■General
Power: 48V phantom - proprietary digital switching
Construction: 14 gauge steel chassis and outer shell
Finish: Durable powder coat
Size: 3.3"" x 5.0"" x 2"" (84 x 127 x 48mm)
Weight: 1.55 lb (720 g)
FCC approval: Complies with section 15 of the FCC Rules
Conditions: For use in dry locations only between 5°C and 40°C