Donn wrote:
In the lower part of the range? That's what I thought was kind of surprising. We don't normally think of going small for the sake of low notes. But I guess we do indulge in some overly simplistic thinking, sometimes.
It may also have to do in part with the shape of the mouthpiece. The TU17 is a German-style bowl-shaped mouthpiece. The 2XL, while very deep, is more Helleberg-ish. The TU17 slots extremely well on my horn and the intonation is spot-on, and the articulation is great. The 2XL gives a broader and more "booming" tone, but is harder to control (and not just because it's the XL variant, I think).
This evening I found that my section mate (with a 186) didn't show up, and I was therefore the only tuba. We played several pieces that required sustained walking bass parts (Glen Miller, for example) and also the third movement ("Burlesque") of Persichetti's "Divertimento". So a lot of time in the compensating register -- or in and out of it. There were times when I wondered "Maybe the 2XL would be better here," but I didn't switch. I think it would have required more effort and produced a less focused and interesting sound. My section mate is now using a PT 50 and it sounds great in the low register. But she doesn't like to venture to or beyond the top of the staff.
In a possibly related vein, I just today tried a Yamaha 60B on my bass trombone -- expecting it to not amount to much. It's not real deep and not real wide. Slightly wider than a Bach 1.25GM, but with (to me) a much more comfortable rim and a somewhat smaller backbore. Shallower, and slightly narrower than a Wick 00AL. Again, a German bowl-shaped piece. Very easy to play, and the pedal notes come out easier and with better tone than on the larger mouthpieces I've been trying. Slots perfectly and plays perfectly in tune. I think it may become my primary bass trombone piece.