Which has a bigger cup — Bach 12C or Yamaha SL-47L?

The Yamaha SL-47L has a cup diameter of 24.98 mm / 0.9835 in compared to 24.50 mm / 0.9646 in on the Bach 12C — a difference of 0.48 mm / 0.0189 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 12C and Yamaha SL-47L?

The Yamaha SL-47L has a medium cup while the Bach 12C has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 12C vs Yamaha SL-47L

Name: Yamaha SL-47L
Brand: Yamaha

The Yamaha SL-47L has a wider cup diameter, the Yamaha SL-47L features a deeper cup.

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

The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.

Mouthpiece A

Bach 12C

• Trombone

Rim width—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Yamaha SL-47L

• Trombone

Rim width—

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 12C details Yamaha SL-47L details Bach 12C equivalents Yamaha SL-47L equivalents

Bach 12C vs Yamaha SL-47L

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