Which has a bigger cup — Bach 4G or Bach 5G (large shank)?

The Bach 4G has a cup diameter of 26.00 mm / 1.0236 in compared to 25.50 mm / 1.0039 in on the Bach 5G (large shank) — a difference of 0.50 mm / 0.0197 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 4G and Bach 5G (large shank)?

Both mouthpieces share a very deep cup depth, so the sound character from depth alone will be very similar.

Bach 4G vs Bach 5G (large shank)

Name: Bach 5G (large shank)
Brand: Bach

The Bach 4G has a wider cup diameter.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material

The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.

Mouthpiece A

Bach 4G

• Trombone

Rim width—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📣High-volume projection — open throat for power

Mouthpiece B

Bach 5G (large shank)

• Trombone

Rim width—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📣High-volume projection — open throat for power

Which is better?

Neither mouthpiece clearly dominates the other — the right choice depends on your embouchure, playing style, and the sound you're after. Try both if possible.

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Bach 4G vs Bach 5G (large shank)

Playing Characteristics

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What Changes If You Switch?

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