I have an SX90R (alto though) and the altissimo is great using the sterling silver neck that came with the horn. Out of curiosity I bought a diamond series neck. To my surprise most of the intonation quirks disapperaed with the new neck. However, the altissimo notes is much more difficult to play compared with my old silver neck. Quite a trade-off and I still haven't decided which neck I like the most.
Apperently, the neck is important for how responsive the altissiomo is, even for necks that have very similar dimensions as for my necks (the material and finish differ of course). Give another neck a try!
/Marcus
Apperently, the neck is important for how responsive the altissiomo is, even for necks that have very similar dimensions as for my necks (the material and finish differ of course). Give another neck a try!
/Marcus