Which has a bigger cup — Bach 14½D or Bach 17?

The Bach 14½D has a cup diameter of 24.50 mm / 0.9646 in compared to 24.20 mm / 0.9528 in on the Bach 17 — a difference of 0.30 mm / 0.0118 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 14½D and Bach 17?

The Bach 17 has a medium cup while the Bach 14½D has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 14½D vs Bach 17

Name: Bach 17
Brand: Bach

The Bach 14½D has a wider cup diameter, the Bach 17 features a deeper cup.

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

Surface plating or treatment (e.g. silver plate, gold trim). Affects feel, durability, and appearance.

Mouthpiece A

Bach 14½D

• Baritone / Euphonium

Finish—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Bach 17

• Baritone / Euphonium

Finish—

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.