Which has a bigger cup — Bach 5 or Schilke 45B?

The Bach 5 has a cup diameter of 25.50 mm / 1.0039 in compared to 24.30 mm / 0.9567 in on the Schilke 45B — a difference of 1.20 mm / 0.0472 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 5 and Schilke 45B?

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

Bach 5 vs Schilke 45B

Name: Schilke 45B
Brand: Schilke

The Bach 5 has a wider cup diameter, the Schilke 45B has a larger throat opening.

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

The taper behind the throat leading to the shank. Affects projection and tone character.

Mouthpiece A

Bach 5

• Trombone

Backbore—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Schilke 45B

• Trombone

Backbore15/64 .2344"

Best suited for

📣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.