Which has a bigger cup — Bach 5GS (large shank) or Bach 6½AL (large shank)?

The Bach 5GS (large shank) has a cup diameter of 25.50 mm / 1.0039 in compared to 25.40 mm / 1.0000 in on the Bach 6½AL (large shank) — a difference of 0.10 mm / 0.0039 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 5GS (large shank) and Bach 6½AL (large shank)?

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

Bach 5GS (large shank) vs Bach 6½AL (large shank)

Name: Bach 6½AL (large shank)
Brand: Bach

The Bach 5GS (large shank) 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 5GS (large shank)

• Trombone

Backbore—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📣High-volume projection — open throat for power

Mouthpiece B

Bach 6½AL (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.

Open in interactive tool + Add third mouthpiece Bach 5GS (large shank) details Bach 6½AL (large shank) details Bach 5GS (large shank) equivalents Bach 6½AL (large shank) equivalents

Bach 5GS (large shank) vs Bach 6½AL (large shank)

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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Compare Bach 6½AL (large shank) with others

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