Radial EngineeringPro48 Active Direct Box


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Radial Pro48

The Radial Pro48's innovative digital switching power supply significantly increases headroom and allows for less distortion while yielding a smooth, linear response extending from 20Hz to well above 100kHz resulting in natural, uncolored signal transfer. This superior performance makes the Pro48 an ideal candidate for use with today's battery-powered active basses and acoustic guitars that tend to overload other direct boxes.

The compact Pro48 is built road-ready with 14-gauge steel in a unique bookend design that provides protective zones around the switches and connectors. The internal welded I-beam construction assures outside stress will not torque the PC board thus assuring longer product life.

The Pro48 is designed for high-use applications wherever an active direct box is called for. A 15dB pad switch is provided to tame hot signal and expands the range of instrument preamps and the ground lift switch helps eliminate hum and buzz problems caused by ground loops.

Pro48 Features

  • High-resolution active direct box
  • Increased dynamic range and headroom
  • 48V phantom-powered with digital switching
  • Compact, rugged book-end design
  • Ideal for active guitars and basses


  • Active acoustic guitar
  • Active bass guitar
  • Active electric guitar with preamp
  • Keyboard / Synthesizer
  • Direct recording
  • Live sound
  • Audio Circuit Type:  Proprietary analog circuit with low-noise op-amp
  • Frequency response:  20Hz ~ 20kHz (± 1.5 dB)
  • Dynamic range:  99dB
  • Noise floor:  -82dB below 0dBu
  • Equivalent input noise:  -86dBu
  • Maximum input:  +9dBu
  • Phase deviation:  +28º at 20Hz | +1º at 1kHz | -2º at 20kHz
  • Total harmonic distortion:  0.001% @ 0 dBu
  • Inter-modulation distortion:  0.002% @ 0 dBu
  • Input impedance:  220kΩ - ¼" input
  • Output impedance:  600Ω - XLR output
  • Input pad:  -15dB
  • Ground lift:  Disconnects pin-1 at XLR output
  • XLR configuration:  AES standard (pin-2 hot)
  • Power:  48V phantom - proprietary digital switching
  • Construction:  14 gauge steel chassis and outer shell, baked enamel finish
  • Size:  2.75" x 4.25" x 1.75" (70 x 108 x 45mm)
  • Weight:  1.2 lb (544 g)
  • FCC approval:  Complies with section 15 of the FCC Rules
  • Warranty:  Radial 3-year, transferable
Radial Engineering Pro48 Active Direct Box Reviews