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. |