Fighting Feedback - Radial Engineering AC DRIVER Manual

FIGhTInG FEEdBAcK

One of the most challenging aspects of using acoustic instruments on stage is managing feedback.
This is particularly difficult when sharing the stage with electric guitars and drums, as the acoustic
instrument needs to be amplified even further. The AC-Driver has two features that help eliminate
feedback on stage; the 180° polarity reverse switch, and the Notch Filter.
As you bring up the level of an acoustic instrument on stage, sound waves from the PA, monitors, and
wall boundaries can combine at certain frequencies to create hot-spots known as room modes which
can cause feedback. The 180° polarity reverse comes to the rescue by enabling you to reverse the
electrical phase which in turn can move the room mode out of the way. If you encounter feedback, try
engaging the 180° switch by moving it to the up position.
º
Monitor Stage Amp Pol in 180 (UP)
position to correct phase
8
Radial Engineering Ltd. AC-Driver™ User Guide