Which has a bigger cup — Bach 12E or Yamaha SL-45AS?

The Bach 12E has a cup diameter of 24.50 mm / 0.9646 in compared to 24.26 mm / 0.9551 in on the Yamaha SL-45AS — a difference of 0.24 mm / 0.0094 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 12E and Yamaha SL-45AS?

The Bach 12E has a shallow cup while the Yamaha SL-45AS has a very shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 12E vs Yamaha SL-45AS

Name: Yamaha SL-45AS
Brand: Yamaha

The Bach 12E has a wider cup diameter, the Bach 12E 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

Yamaha SL-45AS

• Trombone

BackboreSemi-narrow

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 Bach 12E details Yamaha SL-45AS details Bach 12E equivalents Yamaha SL-45AS equivalents

Bach 12E vs Yamaha SL-45AS

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