![](https://www.radialeng.com/wp-content/uploads/2018/04/sb1-input-panel-768x1066.jpg)
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PAD
Reduces the input sensitivity by 10dB for louder instruments such as an active bass guitar or keyboard so that they can be used without distortion.
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Input
Unbalanced hi-Z input connection for your guitar or bass.
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Tuner Out
Always on, this thru connector is used to feed your tuner or your on-stage amplifier.
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![](https://www.radialeng.com/wp-content/uploads/2018/04/sb1-output-panel-768x995.jpg)
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Output
Sends the lo-Z balanced output signal to the PA system or audio workstation.
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Phase
180° polarity reverse helps tame hot spots on stage that can cause feedback.
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![](https://www.radialeng.com/wp-content/uploads/2018/04/sb1-top-768x417.jpg)
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Ground Lift
Disconnect pin-1 at XLR output to reduce hum and buzz caused by ground loops.
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