Which has a bigger cup — Bach 3G or Bach 4GB?

The Bach 3G has a cup diameter of 26.26 mm / 1.0339 in compared to 26.00 mm / 1.0236 in on the Bach 4GB — a difference of 0.26 mm / 0.0102 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 3G and Bach 4GB?

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

Bach 3G vs Bach 4GB

Name: Bach 4GB
Brand: Bach

The Bach 3G 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 3G

• Trombone

Rim width—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📣High-volume projection — open throat for power

Mouthpiece B

Bach 4GB

• 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 3G vs Bach 4GB

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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