Which has a bigger cup — Bach 11C or Bach 14D?

The Bach 11C has a cup diameter of 24.70 mm / 0.9724 in compared to 24.50 mm / 0.9646 in on the Bach 14D — a difference of 0.20 mm / 0.0079 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 11C and Bach 14D?

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

Bach 11C vs Bach 14D

Name: Bach 14D
Brand: Bach

The Bach 11C has a wider cup diameter.

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

The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.

Mouthpiece A

Bach 11C

• Trombone

Throat diameter5.85 mm / 0.2303 in

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Bach 14D

• Trombone

Throat diameter5.85 mm / 0.2303 in

Best suited for

📣High-volume projection — open throat for power

Throat Diameter

Throat diameters are essentially identical at 5.85 mm / 0.2303 in, so resistance feel will be comparable.

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 11C vs Bach 14D

Throat Diameter

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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Compare Bach 14D with others

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