Radial EngineeringStageBug SB-1 Active Acoustic DI Direct Box


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Radial Engineering SB-1

The SB-1 Acoustic, from Radial Engineering, is an active direct box designed with portability in mind. Small enough to fit inside a guitar case, the unit is one of Radial’s most compact devices.

External signals can be routed into the unit via its 1/4” input, and there’s a thru input that can be routed to a tuner or an amplifier. The unit features an active circuit that alters the signal from high to low impedance, minimizing any potential noise. After this, the single is buffered and balanced for external routing. There’s also 48V Phantom Power so users can connect an even wider range of microphones!

If all this wasn’t enough, the SB-1 Acoustic also features a -15dB pad for reducing the sensitivity of the input when used in tandem with louder instruments, like electric basses or keyboards.

SB-1 Features

  • Active direct box for acoustic guitar
  • Ultra compact to fit in your guitar case
  • Plug & play easy to use feature set
  • 48V phantom powered, no batteries needed
  • Audio circuit type: Active Buffer with Phase Splitter
  • Frequency response: 20Hz to 20KHz
  • Total harmonic distortion: <0.006%
  • Dynamic range: >100db
  • Input impedance: 800K/23K
  • Maximum input: +2dbu/+8dbu
  • Gain: +1.3dbu/+4.4db
  • Clip Level Output +3.3dbu/+12.3dbu
  • Output impedance: 330 Ohms
  • Equivalent input noise: -101dbu
  • Noise floor: -97dbu
  • Intermodulation distortion: <0.01%
  • Phase deviation: 25/12 degrees Maximum
  • Switches: Pad, Phase
  • Merge function: Automatic
  • Input pad: -12db
  • Polarity: Yes
  • XLR configuration: + = Pin 2, = Pin 3, Ground = Pin 1


  • Construction: 16 gauge steel chassis & outer shell
  • Finish: Baked enamel
  • Size: (L x W x D) 4.5" x 1,85" x 1.35" (114 mm x 47 mm x 34 mm)
  • Weight: 0.55 lbs (250 grams)
  • Shipping size: (L x W x D) 8.25" x 5" x 1.75" (210 mm x 127 mm x 44 mm)
  • Shipping weight: 0.8 lbs (365 grams)
  • Power: 48V phantom power
  • Warranty: Radial 3-year, transferable
  • Specifications are subject to change without notice.

Dimensions and Weight in Packaging

  • Shipping Weight: 1 lbs
  • Shipping Dimensions: 8 x 5 x 2 in

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Radial Engineering StageBug SB-1 Active Acoustic DI Direct Box Reviews