Radial SB-4 Piezo Compact Active DI

Active Piezo Direct Box

Compact Active DI with Piezo Input

The StageBug SB-4 is a compact active direct box that has been optimized for use with piezo transducers, allowing upright basses, violins, cellos, and other acoustic instruments to be connected to the PA without compromising their tone or frequency response.

The perfect companion for piezo instruments
The StageBug SB-4 allows you to retain the natural tone of your piezo-equipped instrument when amplified through a PA system. Unlike typical direct boxes, the SB-4 features a very high 5 meg-ohm impedance that smooths out troublesome peaks that give piezo transducers a bad name. This higher impedance also broadens the frequency response for a more natural and pleasing sound. The active circuit balances the audio signal to enable long runs up to 100 meters without loss, while delivering spectacular linearity and low distortion throughout the audio range. Output connections include an aux out for a stage amplifier plus a standard XLR output to feed the PA.

Control feedback on stage
To help eliminate feedback on a live stage, the SB-4 is equipped with a high-pass filter and 180° polarity reverse switch. The high pass filter eliminates excessive bottom end which in turn reduces resonance that can cause the instrument to vibrate. The 180° polarity reverse helps reduce acoustic hot spots on stage by changing the phase relationship between the PA system and room acoustics which can combine at certain frequencies to create peaks.

Features:

• Active DI optimized for piezo transducers
• Smooths out peaks & eliminates squawk
• Powered by 48V phantom, no batteries required
• Compact design fits in your instrument case
• HPF
  Reduces excessive bass for more clarity. Eliminates run-away resonant feedback from acoustics.
• Input
  1/4" input is used to connect from the instrument to the StageBug SB-4.
• AUX Out
  1/4" TRS thru connector is used to send the instrument signal to an on-stage amp or to an electronic tuner.
• Output
  XLR balanced 600? mic level output, use to feed mixer or mic preamp.
• Polarity
  180° polarity reverse helps tame hot spots on stage that can cause feedback.
• Warranty: Radial 3-year, transferable

Specifications:

• Audio circuit type: Piezo optimized active buffer
• Frequency response: 20Hz to 20kHz
• Dynamic range: 100dB
• Gain: +2dB
• Total harmonic distortion:<0.006%
• Intermodulation Distortion: <0.01%
• Phase Deviation: 10° @ 50Hz
• Input Impedance: 5Meg Ohms
• Output Impedance: 330 Ohms
• Equivalent Input Noise: -101dBu
• Noise: -97dBu
• Maximum Input: +4dBu
• Features
• 180° polarity reverse, Ground lift, HPF
• Input Connectors: 1/4"
• Output Connectors:XLR
• General
• Construction: 16 gauge steel chassis & outer shell
• Size (L x W x D): 4.5" x 1,85" x 1.35" (114mm x 47mm x 34mm)
• Weight: 0.55 lbs (250 grams)
• Shipping size (L x W x D):8" x 5" x 3" (203mm x 127mm x 76mm)
• Shipping weight: 0.8 lbs (365 grams)
• Power:48V phantom power, 5mA
• Conditions: For use in dry locations only between 5°C and 40°C