VarsityTpt

What exactly is the difference between them, and how much of an impact could these differences have on a player?

Ric232

Assuming they are both built according to factory spec, the 5C has a slightly larger diameter. The impact on a player depends on how long you've been playing and how good you are. If you are a beginner, the difference will be zero. If you are VERY good, the difference will still be very slight with the 5C being a little more comfortable and giving you a slightly bigger sound. What are you trying to accomplish?

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Ric
Comeback Player
2009 Yamaha Xeno 8335S
1983 Mercedes II Bb Trumpet
Yamaha 14B4 (primary)
Yamaha 16C4-GP (rarely)
Bach 3C (retired)

VarsityTpt

As a young trumpeter, I was curious as to what the difference was, because my band director wants all trumpets on at least a 5C (which I am using). I just wasn't quite sure the difference between that and a 7C and how much it would truly make a difference in young players.

Ric232

I really don't think you would notice the difference. Both are fine mouthpieces.

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Ric
Comeback Player
2009 Yamaha Xeno 8335S
1983 Mercedes II Bb Trumpet
Yamaha 14B4 (primary)
Yamaha 16C4-GP (rarely)
Bach 3C (retired)

bagmangood

First off,
that's silly to require everyone to be playing on a certain size mpc. As some one on one of these forums once said - that's like requiring all of the runners to wear shoes bigger than a 9, regardless of foot size.

2nd,
Visually Kanstul Mouthpiece Comparator, look at a B5C and B7C for the comparison

3rd, talk to your private teacher before switching mpcs, and what he wants you to do.

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Bb: Courtois 305 "Elite"
C: Bach C180-239 (Akwright conversion),
Cornet: Conn Wonder (1900)
Picc: Selmer Paris, ~1971

Schwab

I hate it when band directors (or anyone in a position of authority) forces something on someone without any real knowledge about it. It's stupid to say that everyone should play something 5C or larger. I don't and I still work a little. Maybe after the word gets out I won't!

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Dylan Schwab
Stage 1 New York

VarsityTpt

Actually, my private teacher is soon going to have me try out new mouthpieces. I never seriously considered getting a new mouthpiece without approval from him ever since I got the 5C a little over a year ago.
I never really thought of the small difference between the two mouthpieces. I just remember that the freshmen should move to at least a 5C, maybe a 3C, but I believe 5C was suggested.

Dorabil

I have found, and now sort of collect them, that the older Vincent Bach Corp. mouthpieces are really great for me. I believe most were produced in the 1970s. They are very comfortable, they shine up nicely with a bit of Simichrome polish and for me at least they play well on my new and old horns. I have them for both trumpet and cornet in 5C, 6, 7C and 10 1/2C. I have seen them in 6, 6C and 3C but haven't managed to get those yet. I have on a rare occasion seen a 1C. They are also usually reasonably priced on eBay. The newer Bach mouthpieces I like also, but they don't seem to play the same tone on my horns as the ones that say Vincent Bach Corp.
Dottie

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Dottie
Yamaha 2330S Cornet
Holton C602 Cornet
1920 Conn Folded Coach Horn
1920 Conn Bugle
1985 Osmun Coach Horn