This may seem an odd idea, but I have been contemplating the function of one for awhile now...mainly to achieve a tone between the spectrum of a guitar and a banjo. What I intend to do is make a removable sounhole banjo head that can slip in and/or out of the larger D-Hole size of a Maccaferri. I realize how difficult this may be to accomplish, but I think I can work out a usable design that would fit smoothly over the soundhole.
Now for the big question (for any experimenters or luthiers)...will this achieve the tone of a banjo somewhat? Or, alternatively, will I end up with with an odd looking and sounding guitar?
Comments
On a banjo, the "soundhole" is/are the openings between the tone ring (upon which the head is fastened) and the resonator. The tone of a banjo is due to a very thin bridge resting a very tight membrane; quite different than the wooden top and relatively massive bridge of a guitar.
A small aluminum pie dish with holes in it glued to the inside I bet would work....
I'm not really trying to recreate the sound of a banjo with this project, but rather giving a Maccaferri a slight percussive edge for greater tonal nuances. I play a bit of banjo on the side once in awhile, and was trying to think of how to incorporate that percussive edge into the framework of a guitar. Essentially taking the idea of the original internal resonator and making a removable one out of banjo head material.
At this point, I know I can make a suitable device to fit in the soundhole, but I'm not 100% sure it will yield the correct tonal qualities I seek.
The Mac resonators were interesting devices which had a cool function that wasn't what Mario Maccaferri intended. They worked because they partitioned the internal cavity of the guitar into multiple chambers and altered the body/port tuning. Guitar resonators (like steel guitars) are another interesting concept - take a look at the design of Dobros and you'll sort of see what they're doing and it might inspire you.