Which has a bigger cup — Bach 12C or Bach 1G?

The Bach 1G has a cup diameter of 28.00 mm / 1.1024 in compared to 24.50 mm / 0.9646 in on the Bach 12C — a difference of 3.50 mm / 0.1378 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 12C and Bach 1G?

The Bach 1G has a very deep 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 Bach 1G

Name: Bach 1G
Brand: Bach

The Bach 1G has a wider cup diameter, the Bach 1G features a deeper cup, the Bach 1G has a larger throat opening.

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

Bach 1G

• Trombone

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.

Open in interactive tool + Add third mouthpiece Bach 12C details Bach 1G details Bach 12C equivalents Bach 1G equivalents

Bach 12C vs Bach 1G

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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