Which has a bigger cup — Bach 18 or Bach 19?

The Bach 18 has a cup diameter of 24.20 mm / 0.9528 in compared to 24.00 mm / 0.9449 in on the Bach 19 — a difference of 0.20 mm / 0.0079 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 18 and Bach 19?

The Bach 19 has a deep cup while the Bach 18 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 18 vs Bach 19

Name: Bach 19
Brand: Bach

The Bach 18 has a wider cup diameter, the Bach 19 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 18

• Trombone

Backbore—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Bach 19

• Trombone

Backbore—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📣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.