More Better Feedback Buster

The More Better Feedback Buster does exactly what the name suggests. This allows you to play your acoustic guitar at a higher volume with it howling back at you angrily. Available in both a small and large version to accommodate nearly any acoustic guitar. 

Measurements

Small: Fits soundholes with a  3 1/4" diameter (83mm)

Large: Fits soundholes with a 4" diameter (101mm)