Radial Engineering J48 Active Direct DI Box

 
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Radial Engineering J48 Active Direct DI Box

SKU J48
Weight 3.00 lbs
$199.95
Quantity

 

This is for 1- New Radial J48 Active DI Box.  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.

 

 

Features:

  • Ultra low distortion of all types
  • Exceptional headroom & dynamic range
  • Retains instrument's natural sound
  • Powered by 48V phantom

 

 

Specifications:

 

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: +10º at 20Hz | 0º at 1kHz | -1º at 20kHz

Total harmonic distortion: 0.002% @ -5dBu

Inter-modulation distortion: 0.003% @ -3dBu

Input impedance: 220kΩ - ¼" input

Output impedance: 600Ω - XLR output

 

Features  

Merge function: IN and THRU jacks are summed to mono

Input pad: -15dB 

Polarity: 180º signal polarity reverse switch

Low-cut filter: -3 dB @ 80Hz

Ground lift: Disconnects pin-1 at XLR output

XLR configuration: AES standard (pin-2 hot)

 

General  

Power: 48V phantom - proprietary digital switching 

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)

FCC approval: Complies with section 15 of the FCC Rules

Warranty: Radial 3-year, transferable

 

 

Applications:

 

The Radial J48 is a professional direct box that is equally useful for studio as it is for live concert sound and performance. It serves the purpose by converting the high impedance output of an instrument to a low input impedance, microphone level signal that is compatible with mixing console inputs. It also balances the signal to allow long runs to upwards of 1000 feet (300 meters) without appreciable signal loss or noise.

 

Unlike typical direct boxes that simply use phantom power to drive an internal buffer, the J48 actually converts phantom power from DC to AC, then uses a unique internal switching power supply to increase the internal working voltage in order to achieve much greater headroom. Because of this process, the active amplifier (buffer) is not constantly red lining. This means we do not have to trade off frequency response for dynamic range. The result is a response curve that starts at 10Hz and extends well above 40kHz! This assures the natural tone of the instrument is retained without degradation or introducing artifact.

 

 

 

 

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