oedipoes wrote:Is instrument bore and mouthpiece depth related to each other?
larger bore-> shallower mouthpiece
smaller bore-> deeper mouthpiece
I think it has less to do with the bore and more to do with the overall size of the instrument, and its characteristic tone. Tubas that have a woofy tone (fuzzy attacks and lack of color) need mouthpieces that add harmonic content (color) and add crispness to the attack. In my thinking, resistance is what makes it easier to speak the note crisply, and mouthpieces with more of a bowl shape add that useful resistance.
I'm not sure that divide runs cleanly along the American German divide, and all these characterizations overlap a lot in the middle. Thus, I use a large and open mouthpiece for my York Master, which is a largish 4/4 German tuba that approximately follows an American design concept. The Miraphone already provides crisp attacks and a sound with a lot of harmonic content, so it seems to do well with a funnel-shaped mouthpiece. But for a Rudy Meinl, which is large and dark, my temptation would be something with more of a bowl. And, say, a King sousaphone is as American as apple pie, but it's a bright-sounding tuba that to me benefits from a deep funnel.
My Holton is somewhat of a special case. By large tuba standards, it is quite colorful, clean, and focused. But its size relieves me of the need to emphasize the breadth of the tone, and the instrument does best with a bowl mouthpiece. I used for several years a PT-48, which is a great mouthpiece for a big tuba, and for me added considerable clarity. The Stofer Geib has been even better. The mouthpiece that came with that instrument, a Holton Revelation 52, is probably the woofiest mouthpiece I've ever played short of a Reynolds Dr. Young. On the Miraphone, though, both the PT-48 and the Geib those would for me be a little strong.
I don't see any correlation between these characteristics and bore. But some tubas (of whatever size) with a very large bore seem to have been designed to be "open blowing" to the extent that they provide no resistance at all. That makes them quite difficult for me to play, and a mouthpiece that restores that resistance is a good thing.
Rick "for whom some tubas feel like free buzzing" Denney