I have been playing horn for a year or so now, and last week my tutor asked what my mouthpiece was. This got me thinking, as I have heard that mouthpiece size affects sound. I tried my friend's E schmid 85 and it ended up being easier to play higher notes, giving a darker tone, and hitting notes much more reliably. My mouthpiece was bigger, an E schmid 10.
I am not sure if it was just my imagination, but I felt it was easier to change notes when slurring, and I did not need to reposition my lips when playing high notes. The sound felt warmer and more gentle if that makes sense, while I sounded more like a trumpet with my old mouthpiece. Switching between the two did result in a clear contrast, but it is hard to tell which is really "better", and if my mouthpiece is indeed too big.
Any thoughts? What are the signs of having a mouthpiece that is too big? And what mouthpieces would you recommend? I have been told to have pretty small lips