Bach Megatone Bass Trombone
Model No. Depth of Cup Approx. Cup Dia. Rim Shape Description
1G Deep 28.00mm Med. thin, well rounded Extra large and deep for extraordinary power and depth of tone. Among the largest and most powerful bass trombone mouthpieces produced today. .319" throat/800S backbore.
1 1/4GM Deep 27.50mm Med. thin, well rounded. Same rim and cup as 1 1/4G, but with a larger throat and backbore for a large, powerful sound, well in tune. .302" "N" throat/800S backbore.
1 1/4G Deep 27.00mm Med. wide, well rounded. A large mouthpiece with a powerful tone in the low register and great carrying power. For many years, the standard mouthpiece for the serious bass trombone player. .277" "J" throat/429 backbore.
1 1/2GM Deep 27.00mm Med. wide, well rounded. Larger throat and backbore than 1 1/2G results in less resistance, larger dynamic range, deeper, warmer sound. .302" "N" throat/800S backbore.
4G Deep 26.00mm Med. wide, slightly rounded. >Same rim shape and diameter as No. 4 small shank tenor trombone. A versatile, large diameter mouthpiece especially useful when only one trombone is used for both the upper and very low register. .277" throat/429 backbore.
5G Deep 25.50mm Med. wide, semi-flat. Same rim shape and diameter as No. 5 small shank tenor trombone. Fairly large and deep, with a dark, mellow tone, favoring the low register. .277" "J" throat/429 backbore.
5GS Medium 25.50mm Med. wide, semi-flat. Same rim and cup as No. 5G but with .265" (17/64") throat/420 backbore.
6 1/2A Medium 25.40mm Med. wide, well rounded. Same rim and cup as 6 1/2A small shank tenor trombone, but with a full bass trombone throat and backbore for a rich compact sound of large volume. .277" throat/429 backbore.
6 1/2AL Medium 25.40mm Med. wide, well rounded. Same specifications as 6 1/2AL small shank tenor trombone but with .265" throat. Requires well-developed embouchure. .265" (17/64") throat/420 backbore.

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