Radial Sb-4 Piezo Radial Engineeringstagebug Sb-4 Piezo Di

by Radial


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Radial Engineering SB-4 overview


The StageBug SB-4 Piezo DI from Radial Engineering is a compact active direct box that has been optimized for use with piezo transducers. This enables violin, dobro, mandolin, cello, upright bass, and other instruments that are best amplified using a piezo to be connected to a mixing board or recording device.


This unit features a 1/4" input for the instrument pickup and a 10 MΩ impedance that smoothes out troublesome peaks. The higher impedance also broadens the frequency response for a more natural and pleasing sound. The active circuit performs the high-to-low impedance conversion and balances the signal to enable long runs upwards to 328’ (100m) without loss, delivering linearity and low distortion throughout the audio range.

To help eliminate feedback on stage, it 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 top of 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. Reversing the polarity eliminates the acoustic peak without resorting to severe equalization which only serves to compromise the natural tone of the instrument. The unit’s connections include an AUX out for a stage amplifier plus a standard XLR output to feed the PA. Power is derived from the console's 48V phantom, thus eliminating the need for batteries or external supply.

These features combined with the compact size makes this unit a suitable companion for orchestral artists, blue grass players, and pop string quartets that need to turn it up when in concert.

Active DI optimized for piezo transducers
Smoothes out peaks, eliminates squawk
High pass filter eliminates resonance
Ultra compact to fit in your guitar case
Made in Canada

Radial Engineering SB-4 specs

Circuit Type Piezo optimized 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 (L x W x D) 4.50 x 1.85 x 1.35" (114.00 x 47.00 x 34.00 mm)
Weight 8.80 oz (249.48 g)
UPC: 676101040667