Bach 3511HC 1 1/2C Trumpet Mouthpiece: Bach 3511HC Trumpet Mouthpiece 1 1/2C Gold Plated Rim shape is described for each individual model. Model numbers progress numerically from model #1 with the largest cup diameter, to model #20C with the smallest cup diameter.Cup depths are notated with letters. A cups are the deepest; standard cups have no letter designation; progressively shallower cups are marked B through F. A Models have very deep cups, #24 backbores, and emit a large, dark sound.Models with no letter designation have deep cups, #10 backbores, and produce a rich, full, clear tone. B Models have medium deep cups, #7 backbores, and have a full, Teutonic tone with great volume. C Models have medium cups, #10 backbores, and are preferred by many players that alternate between Bb, C and D trumpet. D Models have medium-shallow cups, #76 backbores, and produce a sparkling, brilliant tone, especially in the high register.
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