Which has a bigger cup — Bach 12C or Schilke 38D?

The Bach 12C has a cup diameter of 24.50 mm / 0.9646 in compared to 19.73 mm / 0.7768 in on the Schilke 38D — a difference of 4.77 mm / 0.1878 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 12C and Schilke 38D?

The Schilke 38D has a medium cup while the Bach 12C has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 12C vs Schilke 38D

Name: Schilke 38D
Brand: Schilke

The Bach 12C has a wider cup diameter, the Schilke 38D features a deeper cup.

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 12C

• Baritone / Euphonium

Rim width—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Schilke 38D

• Baritone / Euphonium

Rim width—

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.