i was under the impression a hole in the resonator head was primarily to vent the drum as to effect the bass drum pedal?
also i have been told by many drummers to remove the head or cut a hole in it so as to get rid of the ring?
i have a 22''x14'' i have been fighting getting rid of the ring and currently i am using a sand bag against the resonator head to eliminate it, ( i need to get back to tuning on it ).
i like the sound of a bass drum with the resonator head, no hole, tuned, and a drummer with a heavy foot.