Radial Stagebug User Guide
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Using The StageBug™ SB-6

The following page describes how to use the SB-6. Feel free to download the complete manual by clicking on the icon at left.


The SB-6 is a passive audio signal isolator designed for balanced and unbalanced signals. It features ¼" TRS connectors for both the inputs and outputs and will self configure when connected to either ¼" TRS or guitar style mono ¼" TS plugs. The two channels operate independently for dual mono or stereo use and it is equally suitable for instruments, consumer electronics and professional line level devices. As the SB-6 is completely passive, it does not require any powering to make it work. You simply plug in and begin to play.

Making connections

As with any audio system, it is good practice to turn volume levels down or audio systems to off to prevent plug-in transients from damaging more sensitive components such as tweeters. Connections to and from the SB-6 are done using cables terminated with ¼" plugs. The innovative circuitry allows both mono and TRS connectors to be employed and the SB-6 will automatically configure itself to deliver the output based on the type of connector in use.

Although the SB-6 is very efficient, as a passive device there will be a bit of signal loss (0.2dB) as it passes through the circuit. This is easily compensated for by increasing the drive or receive level controls. When going from a balanced to an unbalanced signal, one should expect a greater amount of signal loss (-6dB) as balanced signals are generally much hotter than their unbalanced counterparts.

Using the Pad

Once connected, bring up the signal levels to a comfortable listening volume. If you encounter distortion, try depressing the -10dB pad. This reduces the sensitivity at the input, which in turn, reduces the amount of signal being sent to the transformer. A typical example would be a digital piano. These devices have huge amounts of dynamic range and a very wide frequency response which could otherwise saturate the transformer.

Using the 180° polarity reverse

As a bonus feature, the SB-6 is equipped with a polarity reverse switch that can be used to phase-align the output should it be reversed. A good example would be when taking the output from a stereo guitar effect and driving it to two amps. Often, guitar amps are not in phase and providing isolation eliminate nasty buzz and hum caused by ground loops.

Typical signal ranges:

Source: Instrument Consumer Hi-Fi Pro-balanced
Minimum level handling: -40dB -20dB -10dB
Maxmimum level handling: -10dB +4dB +14dB