Which has a bigger cup — Bach 4G or Bach 5G (large shank)?

The Bach 4G has a cup diameter of 26.00 mm / 1.0236 in compared to 25.50 mm / 1.0039 in on the Bach 5G (large shank) — a difference of 0.50 mm / 0.0197 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 4G and Bach 5G (large shank)?

Both mouthpieces share a very deep cup depth, so the sound character from depth alone will be very similar.

Bach 4G vs Bach 5G (large shank)

Name: Bach 5G (large shank)
Brand: Bach

The Bach 4G has a wider cup diameter.

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 4G

• Trombone

Backbore—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📣High-volume projection — open throat for power

Mouthpiece B

Bach 5G (large shank)

• 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.

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Bach 4G vs Bach 5G (large shank)

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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