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

Base metal or construction (e.g. brass, stainless steel, plastic). Influences weight, response, and tone color.

Mouthpiece A

Bach 18

• Tuba

Material—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Bach 24AW

• Tuba

Material—

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.