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

Both mouthpieces have virtually identical cup diameters at 26.00 mm / 1.0236 in.

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

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

Bach 4G vs Bach 4GB

Name: Bach 4GB
Brand: Bach

Both mouthpieces share similar core dimensions — the differences are in the details.

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 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.

Open in interactive tool + Add third mouthpiece Bach 4G details Bach 4GB details Bach 4G equivalents Bach 4GB equivalents

Bach 4G vs Bach 4GB

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

Compare Bach 4G with others

Compare Bach 4GB with others

Popular Trombone comparisons

Browse by specification