Which has a bigger cup — Giardinelli 4M or Kelly BEAST-LS-SS?

The Kelly BEAST-LS-SS has a cup diameter of 28.70 mm / 1.1299 in compared to 25.40 mm / 1.0000 in on the Giardinelli 4M — a difference of 3.30 mm / 0.1299 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Giardinelli 4M and Kelly BEAST-LS-SS?

The Kelly BEAST-LS-SS has a — cup while the Giardinelli 4M has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Giardinelli 4M vs Kelly BEAST-LS-SS

Name: Kelly BEAST-LS-SS
Brand: Kelly

The Kelly BEAST-LS-SS has a wider cup diameter, the Kelly BEAST-LS-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

Giardinelli 4M

• Trombone

Backbore1/4" (.250)

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Kelly BEAST-LS-SS

• Trombone

Bass

BackboreXL

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📋Extreme bass trombone; maximum breath support required

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 Giardinelli 4M details Kelly BEAST-LS-SS details Giardinelli 4M equivalents Kelly BEAST-LS-SS equivalents

Giardinelli 4M vs Kelly BEAST-LS-SS

Playing Characteristics

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