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Radial SB-5 Compact Stereo DI For Computers With Sidewinder Attached Cable

Product Code RASB-5
Manufacturer Radial

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The Radial Stage Bug SB-5 is a compact stereo direct box designed to accommodate laptop computers, tablets and other consumer audio products when amplifying the signal through a PA system.

The passive design begins with an integrated input cable that connects from the headphone out via a flexible 1.5m (5') cable that is terminated with a standard 3.5mm (1/8") stereo connector. The cable is secured via a clamping strain relief and is wrapped using the sidewinder cleat for easy storage. This of course eliminates having to locate a cable making it easier to deploy in fast paced work environments.

Inside, the unbalanced stereo signal is sent to a pair of custom wound transformers which balances the signals for long cable runs - upwards to 100 meters (300'), without noise. Transformers further benefit by isolating the computer from the PA system to help eliminate hum and buzz caused by ground loops. This is augmented with a ground lift switch to further reduce ground contamination.

A choice of output connectors is available including a stereo set of ¼" TRS jacks for full stereo operation or an XLR out that automatically sums the left-right program material to mono. This can save valuable channels on the PA system and makes setup easier in situations where full stereo reproduction is not required. A -15dB input pad may be engaged to reduce sensitivity and enable extra high output sources to be connected without distortion.

These features combine to make the SB-5 the perfect tool-kit DI for the AV technician, media manager or traveling musician equipped with a computer.

Key Features

  • Stereo direct box for laptop computer
  • Integral 1.5m cable with sidewinder cleat
  • Transformer isolation eliminates noise
  • Plug & play easy to use – no power required


Audio circuit type: Passive, transformer based
Number of channels: Two channels, mono or stereo outputs
Frequency response: 20Hz ~ 20KHz (± 1dB)
Dynamic range: 100dB
Maximum input: +20dB
Total harmonic distortion: 0.01% @ 1kHz
Phase deviation: 2° @ 100Hz; 5° @ 50Hz
Input impedance: 40k Ohms, unbalanced
Output impedance: 2.8k Ohms, balanced


Transformer: Custom design
Input pad: -10dB
Auto Merge: Sums left & right sources to mono at XLR
Ground lift: Disconnects pin-1 at 1/4" TRS outputs
XLR configuration: AES standard (pin-2 hot)
Input connector: 3.5mm (1/8") integrated 1.5m (5') cable
Output connectors: 1/4" TRS stereo / XLR-M mono merge


Construction: 14 gauge steel chassis & outer shell
Finish: Durable powder coat
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: Passive, no power required
Conditions: For use in dry locations only between 5°C and 40°C

Warranty:Radial 3-year, transferable

Equipment available to buy from this site is for professional use only. Please note in certain countries some products listed may not be available from A.C. Entertainment Technologies Ltd.

E&OE. Information is subject to change without notice. The rights and ownership of all trademarks are recognised.


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