Bach Standard Bass Trombone
Model No. Depth of Cup Approx. Cup Dia. Rim Shape Description
1G Deep 28.00mm Medium 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 1/4G Deep 27.50mm Medium thin, well rounded. Cup diameter is smaller than 1G, but still very large and deep, with the sonority preferred by the modern American school. .276" throat/429 backbore.
1 1/4GM Deep 27.50mm Medium thin, well rounded. Same rim and cup as 1 1/4G, but with a larger throat and backbore for large, powerful sound, well in tune. .319" throat/800S backbore.
1 1/2G Deep 27.00mm Medium wide, well rounded. A large mouthpiece with powerful tone in the low register and great carrying power. For many years, the standard mouthpiece for the serious bass trombone player. .276" throat/429 backbore.
1 1/2GM Deep 27.00mm Medium wide, well rounded. Larger throat and backbore than the 1 1/2G results in less resistance, larger dynamic range, deeper, warmer sound. .319" throat/800S backbore.
2G Deep 26.75mm Medium narrow Deep, full, resonant tone; big low register even through the pedal tones. .276" throat/429 backbore.
3G Deep 26.26mm Medium wide, well rounded. Same rim shape and diameter as No. 3 small shank tenor trombone but with a deep bass trombone cup, throat, and backbore to facilitate pedal tones. .276" throat/429 backbore.
4G Deep 26.00mm Medium 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. .276" throat/429 backbore.
4GB Deep 26.00mm Medium thin, very well-rounded. Same as 4G except for rim.
5G Deep 25.50mm Medium wide, semi-flat. Same rim shape and diameter as No.5 small shank tenor trombone. Similar playing characteristics to 4G with a slightly smaller cup diameter. .276" throat/429 backbore.
5GL Medium deep 25.50mm Medium wide, semi-flat. Old style, shallower model than 5G, facilitates upper range. .276" throat/429 backbore.
5GB Deep 25.50mm Medium thin, very well rounded. Same cup, throat and backbore as the 5G with a more rounded rim. .276" throat/429 backbore.
5GS Medium deep 25.50mm Medium wide, semi-flat. Shallower "G"-style cup with smaller throat and backbore than 5G. Produces an easy high register, slightly brighter sound. .261" “G” throat/429 (modified) backbore.
6 1/2A Medium deep 25.40mm Medium wide, well rounded. Same rim and cup as 6 1/2A small shank tenor trombone, but with full bass trombone throat and backbore for a rich, compact sound of large volume. .276" throat/429 backbore.
6 1/2AL Medium deep 25.40mm Medium wide, well rounded. The same cup, throat, and backbore as 6 1/2AL small shank tenor trombone but with bass shank. It requires a well-developed embouchure. .261" "G" throat/420 backbore.
6 1/2AM Medium deep 25.40mm Medium wide, well rounded. The same rim, cup, throat, and backbore as 6 1/2AM small shank tenor trombone mouthpiece, but with bass shank. .257" "F" throat/413 backbore.

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