Radial StageBug SB-5

Passive Stereo Direct Box For Laptops & Mobile Devices


Radial StageBug SB-5

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

  • Stereo direct box for laptops, smartphones, and tablets
  • Cable with 3.5mm stereo plug to connect to mobile devices
  • Transformer isolation eliminates hum and buzz
  • Plug & play is easy to use, and no power is required
  • The compact design fits in your laptop bag

The easy way to connect to the PA

The StageBug SB-5 provides an easy-to-use professional interface for connecting any mobile playback device to a mixer or PA system, with a built-in cable and 3.5mm stereo plug to connect directly to your laptop, smartphone, or tablet. Inside, a pair of custom-wound transformers isolate the signals to prevent hum and buzz and balance the audio to feed long cable runs without noise. Left and right 1/4″ TRS outputs are provided for stereo operation, or a mono XLR output can be used to save channels on the PA system. The SB-5 works without any power required and features additional ground lift and pad switches to eliminate ground loop noise and prevent distortion from high-output audio sources.

The Radial Stage Bug SB-5 Laptop is a stereo direct box designed to easily integrate with laptop computers and other audio sources that employ a mini 3.6mm (1/8″ TRS) connector. It features an integral cable and storage cleat for easy deployment. inside, the passive design features two custom transformers that perform the balancing and impedance conversion. Transformer isolation benefits by eliminating hum and buzz caused by ground loops. Although remarkably compact and affordable, the SB-5 produces an exceptionally linear response with almost zero phase shift and less than 0.2% distortion at all frequencies. This makes the Stage Bug SB-5 an excellent choice for audio playback via PA systems, audio-visual integration, and portable DJ setups.

Audio circuit type: Passive, transformer-based
Number of channels: Two channels
Frequency response: 20Hz ~ 20KHz (± 1dB)
Dynamic range: 100dB
Total harmonic distortion: 0.01% @ 1kHz
Phase Deviation: 2° @ 100Hz; 5° @ 50Hz
Input Impedance: 40k Ohms, unbalanced
Output Impedance: 2.8k Ohms, balanced
Maximum Input: +20dB
Input pad, Mono Sum, Ground lift
Input Connectors: 3.5mm
Output Connectors: 1/4″ TRS, XLR
Construction: 14 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: Passive, no power required
Conditions: For use in dry locations only between 5°C and 40°C
Warranty: Radial 3-year, transferable


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