Which has a bigger cup — Bach 4G or Schilke 45B?

The Bach 4G has a cup diameter of 26.00 mm / 1.0236 in compared to 24.30 mm / 0.9567 in on the Schilke 45B — a difference of 1.70 mm / 0.0669 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 4G and Schilke 45B?

The Bach 4G has a very deep cup while the Schilke 45B has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 4G vs Schilke 45B

Name: Schilke 45B
Brand: Schilke

The Bach 4G has a wider cup diameter, the Bach 4G features a deeper cup, the Bach 4G 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 4G

• Trombone

Backbore—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📣High-volume projection — open throat for power

Mouthpiece B

Schilke 45B

• Trombone

Backbore15/64 .2344"

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 4G details Schilke 45B details Bach 4G equivalents Schilke 45B equivalents

Bach 4G vs Schilke 45B

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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