Which has a bigger cup — Bach 18D or Schilke 38D?

The Bach 18D has a cup diameter of 24.20 mm / 0.9528 in compared to 19.73 mm / 0.7768 in on the Schilke 38D — a difference of 4.47 mm / 0.1760 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 18D and Schilke 38D?

The Schilke 38D has a medium cup while the Bach 18D has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 18D vs Schilke 38D

Name: Schilke 38D
Brand: Schilke

The Bach 18D 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

Base metal or construction (e.g. brass, stainless steel, plastic). Influences weight, response, and tone color.

Mouthpiece A

Bach 18D

• Baritone / Euphonium

Material—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Schilke 38D

• Baritone / Euphonium

Material—

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.