Radial Engineering StageBug SB-4 Piezo DI

Product #96284 | SKU RA-SB-4 | Radial
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The Radial Engineering StageBug SB-4 Piezo DI 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.

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.


Circuit Type Piezo optimised active buffer
Frequency Response 20 Hz to 20 kHz
Total Harmonic Distortion 0.006%
Dynamic Range 100 dB
Input Impedance 5 MΩ
Maximum Input +4 dBu
Gain 2 dB
Output Impedance 330 Ω
Equivalent Input Noise -101 dBu
Noise Floor -97 dBu
Intermodulation Distortion <0.01%
Deviation Phase: 10° @ 50 Hz
Switches High Pass Filter, Phase, Ground Lift
Low-Cut Filter 150 Hz
Filter Slope: 6 dB/octave
Instrument Input 1/4" buffered with piezo optimized load
Auxiliary Output 1/4" buffered to drive guitar effects, amplifier, or tuner
Balanced Output Pin-1 ground, pin-2 (+), pin-3 (-)
Others Polarity Reverse: 180°
Ground Lift: Soft lift with 100 Ω to ground
Construction 16 gauge steel chassis & outer shell
Finish Baked enamel
Power 48 V phantom power
Dimensions 114.00 x 47.00 x 34.00 mm
Weight 249.48 g

In The Box

  • Radial Engineering StageBug SB-4 Piezo DI


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  • Product: Radial Engineering StageBug SB-4 Piezo DI
  • Manufacturer: Radial
  • Model: RA-SB-4
  • SKU: RA-SB-4
  • RM Product #: 96284
  • Warranty: 5 year manufacturer warranty

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