Which has a bigger cup — Bach 12E or Kelly BASS-BONE-LS?

The Kelly BASS-BONE-LS has a cup diameter of 27.69 mm / 1.0902 in compared to 24.50 mm / 0.9646 in on the Bach 12E — a difference of 3.19 mm / 0.1256 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 12E and Kelly BASS-BONE-LS?

The Kelly BASS-BONE-LS has a — cup while the Bach 12E has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 12E vs Kelly BASS-BONE-LS

Name: Kelly BASS-BONE-LS
Brand: Kelly

The Kelly BASS-BONE-LS has a wider cup diameter, the Kelly BASS-BONE-LS 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

Bach 12E

• Trombone

Backbore—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Kelly BASS-BONE-LS

• Trombone

Bass

BackboreL

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📋Bass trombone; tuba/euphonium doublers

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 Bach 12E details Kelly BASS-BONE-LS details Bach 12E equivalents Kelly BASS-BONE-LS equivalents

Bach 12E vs Kelly BASS-BONE-LS

Playing Characteristics

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Which is better?

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