Which has a bigger cup — Kelly 5G-EU-SS 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 5G-EU-SS — 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 5G-EU-SS and Schilke 51D?

The Kelly 5G-EU-SS 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 5G-EU-SS vs Schilke 51D

Name: Schilke 51D
Brand: Schilke

The Schilke 51D has a wider cup diameter, the Kelly 5G-EU-SS features a deeper cup.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material

The taper behind the throat leading to the shank. Affects projection and tone character.

Mouthpiece A

Kelly 5G-EU-SS

• Baritone / Euphonium

General

BackboreL

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📋Euphonium general use

Mouthpiece B

Schilke 51D

• Baritone / Euphonium

BackboreJ .277"

Best suited for

📣High-volume projection — open throat for power

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-SS details Schilke 51D details Kelly 5G-EU-SS equivalents Schilke 51D equivalents

Kelly 5G-EU-SS vs Schilke 51D

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

Compare Kelly 5G-EU-SS with others

Compare Schilke 51D with others

Popular Baritone / Euphonium comparisons

Kelly vs Schilke

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