Which has a bigger cup — Bach 18 or Bach 24AW?

The Bach 18 has a cup diameter of 32.10 mm / 1.2638 in compared to 31.25 mm / 1.2303 in on the Bach 24AW — a difference of 0.85 mm / 0.0335 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 24AW?

The Bach 24AW has a very 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 24AW

Name: Bach 24AW
Brand: Bach

The Bach 18 has a wider cup diameter, the Bach 24AW 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 18

• Tuba

Rim width—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Bach 24AW

• Tuba

Rim width—

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.