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Radial Engineering StageBug SB-4 Active DI – Direct Injection Box SB4


StageBug SB-4 Active DI – Direct Injection Box

Available on back-order

SKU: SB4 Categories: , , Tags: , , , , , , , , ,


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.



• Active direct box for acoustic instruments
• Ultra compact to fit in your guitar case
• Plug & play easy to use feature set
• 48V phantom powered, no batteries needed!



• 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
• 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



SB1 – Passive DI
SB2 – Active DI


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Weight .25 kg
Dimensions 20.3 × 12.7 × 7.6 cm