In reading up on some old threads in the forums someone suggested a mouthpiece for my horn which has a large chamber. I figured I would try a large chamber mouthpiece and see if I see a difference. The sound or the change I am looking for isn't my question but rather how do you know if a mouthpiece has a large chamber inside of it with out actually looking at it? I have seen mention of tip openings and occasionally someone here on the forums will describe the chamber size that a given model has but how am I to know if buying over the web ? What would indicate to me that a mouthpiece has a large chamber?