Which has a bigger cup — Kelly 51D-EU or Schilke 51D?

The Schilke 51D has a cup diameter of 25.55 mm / 1.0059 in compared to 25.40 mm / 1.0000 in on the Kelly 51D-EU — a difference of 0.15 mm / 0.0059 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Kelly 51D-EU and Schilke 51D?

The Kelly 51D-EU has a — cup while the Schilke 51D has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Kelly 51D-EU vs Schilke 51D

Name: Schilke 51D
Brand: Schilke

The Schilke 51D has a wider cup diameter, the Kelly 51D-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 51D-EU

• Baritone / Euphonium

Professional

MaterialLexan polycarbonate

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📋Professional euphonium

Mouthpiece B

Schilke 51D

• Baritone / Euphonium

Material—

Best suited for

📣High-volume projection — open throat for power

Material

The Kelly 51D-EU is described as Lexan polycarbonate, and the Schilke 51D 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.

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Kelly 51D-EU vs Schilke 51D

Material

Playing Characteristics

What Do These Model Names Mean?

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