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Re: Hole in the bell

Author: vintschevski
Date: 2021-12-28 05:44

Tony, this thread might be useful:

http://test.woodwind.org/clarinet/BBoard/read.html?f=1&i=342361&t=342350

Here is part of one of David Spiegelthal's comments in that thread:

"I've found that the bell hole has a much greater effect (more than twice) on the pitch of the low chalumeau E/F than on the corresponding upper 12ths (low clarion B/C). This observation is borne out by the discussion of "tonehole correction length" in Arthur Benade's book on musical instrument acoustics.

Roughly, the hole is about 1/4" in diameter and located about 1-1/2 to 2 inches from the tenon end of the bell (just slightly below the lower end of the tenon socket). Clocking around the bell makes no difference; I always put the hole on the bottom side opposite the bell logo just to make it less obvious. If you want to get fancy, it probably helps a bit to flare both the interior and exterior of the hole (i.e. making the hole slightly hourglass-shaped) using a Dremel and/or countersink tool."

But there are further details worth checking out in that thread as above.

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