Which has a bigger cup — Bach 4C or Schilke 38D?

The Bach 4C has a cup diameter of 25.75 mm / 1.0138 in compared to 19.73 mm / 0.7768 in on the Schilke 38D — a difference of 6.02 mm / 0.2370 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 4C and Schilke 38D?

The Schilke 38D has a medium cup while the Bach 4C has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 4C vs Schilke 38D

Name: Schilke 38D
Brand: Schilke

The Bach 4C 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 narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.

Mouthpiece A

Bach 4C

• Baritone / Euphonium

Throat diameter5.85 mm / 0.2303 in

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Schilke 38D

• Baritone / Euphonium

Throat diameter—

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.