hyperbolica wrote: ↑Tue Jul 07, 2020 2:47 am
I'm certainly no expert, but when I played alto, a smaller mouthpiece gave a more characteristic sound. I used a Christian Lindberg 15. Anything larger you might as well use a small tenor, soundwise. I'm a fan of Doug's stuff (and big rims) for tenor. You've got some time, you should probably see if you can make a small piece work.
If you check out the specs. online, you'll discover that the CL 15 actually has a pretty big rim size - I don't have the numbers in front of me (Hickeys has a comparative chart). Christian's numbering system has nothing to do with traditional Bach numbers.
Some players can get the best results by scaling down the size of the entire mouthpiece including the rim for playing the alto (and small-bore tenor as well). Others, like me, struggle with a small rim size. Pretty much everyone benefits from having the cup/backbore be small to be appropriate to the alto.
Some players have more than one mouthpiece for the alto - different set-ups for larger sized pieces like Brahms symphonies and the Schubert C major, and a smaller set-up for Mozart choral works, etc.
Try out some of the suggestions that have been made so far - if a small rim size is a problem, then there are lots of great options like Doug Elliott, Greg Black, Griego, etc. that make mouthpieces with larger rims that are mated to smaller cups. The one thing that I would suggest against is using something like a small shank 5G in the alto - the cup is way too deep and pitch will go crazy. Good luck.
Jim Scott