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The Radial Pro48 is an active direct box with nine times more headroom than the competition, less distortion and a great price.
Following the trail blazed by the immensely popular Radial J48, the Pro48 is a scaled back version that incorporates the same digitally controlled switching power supply that steps up the rail voltage from the typical 1 volt to an astounding 9 volts!
The Radial Pro48 features a compact yet ultra solid 14 gauge steel enclosure with a book-end protective sleeve. It is equipped with 1/4-inch input and thru, -15dB pad, ground lift and 48V phantom power indicator LED.
Radial Chief Engineer Denis Rozon comments: Today, most instruments such as acoustic guitars and basses are equipped with internal preamps called buffers. These can develop anywhere from 3 volts to 6 volts when turned up and played hard. This excessive output level overloads typical direct boxes as they are unable to handle the signal due to the limitations of phantom powering. We developed a work-around in the J48 by using the same trick that power amplifier companies now use to increase the efficiency of their amps. It is called digital switching. Essentially, we take phantom power and convert the high voltage and low current from DC into AC using a special transformer and digital timing chip. We then filter the power and reconvert it to DC to get our 9 volt rails. High rail voltage means more signal handling and less distortion. With demanding customers like Bruce Springsteen and Jerry Douglas using the Radial J48 on their guitars, you can be sure the sound is right.
Circuit type: Active with proprietary phantom powered switching supply
Input: 1/4 inch - 220 kOhms
Input pad: -15 dB
Output: XLR-M - 600 Ohm, pin-2 hot
Thruput: 1/4 inch - with mono merge function
Frequency response: 20 z to 40 kHz
Linear performance: +/- 0.12 dB 20 Hz to 20 kHz
Power: 48V phantom w/LED indicator
Construction: 14 gauge steel, baked enamel finish
Size: 4.25 d x 2.75 w x 2.75 h inches
Weight: 1.1 lb
Radial Pro48 Active Direct Box Specifications
Product Specifications
Radial Pro48 Specifications
Circuit type: Active with proprietary phantom powered switching supply
Input: 1/4 inch - 220 kOhms
Input pad: -15 dB
Output: XLR-M - 600 Ohm, pin-2 hot
Thruput: 1/4 inch - with mono merge function
Frequency response: 20 z to 40 kHz
Linear performance: +/- 0.12 dB 20 Hz to 20 kHz
Power: 48V phantom w/LED indicator
Construction: 14 gauge steel, baked enamel finish
Size: 4.25 d x 2.75 w x 2.75 h inches
Weight: 1.1 lb
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John G. 🇺🇸
Verified Buyer
Are you using a passive
Are you using a passive DI and finding that you have to use a boost pedal and max your guitars volume with your mixer channel at 75% ?
Yup, me too until a the sound engineer fora festival we were playing ran up on stage in during our strand insisted that we switch over to his DI’s. I quickly glance...
Published date
11/17/25
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Van A. 🇺🇸
Verified Buyer
ACOUSTIC GUITAR HEAVEN
I'm using this on a taylor acoustic guitar straight into an apollo interface and the guitar is clean,detailed and full sounding...WOW! hard to believe that in my 40 plus years playing and recording I hadn't been using this before now..Get it...you won't regret it!
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