Which has a bigger cup — Bach 18 or Bruno Tilz 306-5 GS?

The Bruno Tilz 306-5 GS has a cup diameter of 26.00 mm / 1.0236 in compared to 24.20 mm / 0.9528 in on the Bach 18 — a difference of 1.80 mm / 0.0709 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 18 and Bruno Tilz 306-5 GS?

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

Bach 18 vs Bruno Tilz 306-5 GS

Name: Bruno Tilz 306-5 GS
Brand: Bruno Tilz

The Bruno Tilz 306-5 GS has a wider cup diameter, the Bruno Tilz 306-5 GS has a larger throat opening.

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 18

• Trombone

Backbore—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Bruno Tilz 306-5 GS

• Trombone

Catalog

Backbore—

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.

Open in interactive tool + Add third mouthpiece Bach 18 details Bruno Tilz 306-5 GS details Bach 18 equivalents Bruno Tilz 306-5 GS equivalents

Bach 18 vs Bruno Tilz 306-5 GS

Playing Characteristics

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Which is better?

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