Which has a bigger cup — Kelly 5G-EU or Schilke 38D?

The Kelly 5G-EU has a cup diameter of 25.40 mm / 1.0000 in compared to 19.73 mm / 0.7768 in on the Schilke 38D — a difference of 5.67 mm / 0.2232 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Kelly 5G-EU and Schilke 38D?

The Kelly 5G-EU has a — cup while the Schilke 38D has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Kelly 5G-EU vs Schilke 38D

Name: Schilke 38D
Brand: Schilke

The Kelly 5G-EU has a wider cup diameter, the Kelly 5G-EU 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

Kelly 5G-EU

• Baritone / Euphonium

General

MaterialLexan polycarbonate

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📋Euphonium general use

Mouthpiece B

Schilke 38D

• Baritone / Euphonium

Material—

Material

The Kelly 5G-EU is described as Lexan polycarbonate, and the Schilke 38D as unspecified. Material affects mass, warmth, and how quickly the piece responds.

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.

Open in interactive tool + Add third mouthpiece Kelly 5G-EU details Schilke 38D details Kelly 5G-EU equivalents Schilke 38D equivalents

Kelly 5G-EU vs Schilke 38D

Material

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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