Which has a bigger cup — Bach 15 or Bach 19?

The Bach 15 has a cup diameter of 24.40 mm / 0.9606 in compared to 24.00 mm / 0.9449 in on the Bach 19 — a difference of 0.40 mm / 0.0157 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 15 and Bach 19?

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

Bach 15 vs Bach 19

Name: Bach 19
Brand: Bach

The Bach 15 has a wider cup diameter.

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

The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.

Mouthpiece A

Bach 15

• Trombone

Throat diameter5.85 mm / 0.2303 in

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📣High-volume projection — open throat for power

Mouthpiece B

Bach 19

• Trombone

Throat diameter5.85 mm / 0.2303 in

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📣High-volume projection — open throat for power

Throat Diameter

Throat diameters are essentially identical at 5.85 mm / 0.2303 in, so resistance feel will be comparable.

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 15 details Bach 19 details Bach 15 equivalents Bach 19 equivalents

Bach 15 vs Bach 19

Throat Diameter

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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