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Radial J48 DI


Radial J48 DI


Radial J48 DI


The Radial J48 has been designed from the ground up to deliver the most natural tone. As a direct box manufacturer, we do not believe it is our task to alter the sound of your prized '1962 Fender Jazz Bass', but retain and transfer the true character of the instrument to the mixing console without adding distortion or introducing artifact. This design philosophy has gained a tremendous following from many of the world's most demanding musicians.

Using only 48V phantom power, the Radial J48 is an active direct box that produces an exceptionally linear response that extends from 20Hz up to well above 40kHz. Low distortion of all types is achieved via a unique digital switching power supply that raises the internal operating rail voltage for added headroom and improved signal handling. The results are truly amazing. The J48 delivers an ideal even-order harmonic cascade and a sonic performance that outperforms DIs costing several hundreds more.

And like all Radial products, the J48 is both feature-rich for studio and made tough to handle the road. This includes a -15dB input pad to tame extra loud signals, 180º polarity reverse for feedback control on stage and a ground lift to help reduce hum & buzz caused by ground loops. Special features include a merge function that elegantly mixes left-right signals to mono without phase cancellation. To minimize resonant feedback with acoustic instruments, the J48 is also equipped with an 80Hz high-pass filter (low-cut). When engaged, this also increases headroom by eliminating unneeded bass frequencies.

Radial's innovative book-end design protects switches and connectors from abuse while the internal I-beam construction eliminates stress on the PC board. This serves to reduce solder joints from going 'cold' and delivers trouble-free performance for years. A full-bottom no-slip pad provides mechanical and electrical isolation while providing plenty of 'stay-put' for rockin' stages!

The Radial J48 is used by artists as diverse as acoustic guitarist Tommy Emmanuel; super-star engineer Joe Chiccarelli; and one of the most successful bands of all time Fleetwood Mac. The Radial J48… the world's finest 48V phantom powered active direct box.

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Audio circuit type: Proprietary analog circuit with low-noise op-amp
Frequency range: 10Hz ~ 40kHz
Frequency response: +0dB /-0.5dB 20Hz ~ 20kHz
Signal to noise: 108.4dB @ maximum output
Noise floor: -140dB
Maximum input: +9 Volts
Phase deviation: +10º at 20Hz|  0º at 1kHz|  0º at 20kHz
Total harmonic distortion: 0.001%@20Hz|  0.001%@1kHz|  0.002%@10kHz
Inter-modulation: 0.002% @ +0dB
Inputs: ¼" jack for INPUT - ¼" jack for THRU
Merge function: Stereo to mono mix using the IN and THRU jacks for left and right
Input impedance: 220kΩ at the ¼" INPUT jack
Input pad: -15dB
Output impedance: 200Ω - Balanced XLR-M connector
Polarity: 180º reverse switch
Filter: High-pass filter -3dB@80Hz (Low-cut)
XLR configuration: AES standard – pin-1 ground, pin-2 hot
Power: 48V phantom - proprietary digital switching
Ground lift: LIFT switch - XLR out pin-1
Construction: 14 gauge steel chassis and outer shell, baked enamel finish
Size: 3.3" x 5.0" x 2" (84 x 127 x 48mm)
Weight: 1.55 lb (720 g)