Using Soundhole Inserts to Vary the Lower Resonant Frequencies of an Acoustic Guitar

2023
AL#149 p.50               
Mark French   Eddy Efendy                                                                                       

▪ Putting a tube in the port of a loudspeaker box changes the lower resonances. Makers of classical guitars have known about that for a century and a half. They call that tube a tornavoz. French and Efendy give us the math on how it works.