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

The Bach 4GB 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 4GB and Schilke 45B?

The Bach 4GB 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 4GB vs Schilke 45B

Name: Schilke 45B
Brand: Schilke

The Bach 4GB has a wider cup diameter, the Bach 4GB features a deeper cup, the Bach 4GB has a larger throat opening.

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

The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.

Mouthpiece A

Bach 4GB

• Trombone

Rim width—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📣High-volume projection — open throat for power

Mouthpiece B

Schilke 45B

• Trombone

Rim width—

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 4GB details Schilke 45B details Bach 4GB equivalents Schilke 45B equivalents

Bach 4GB vs Schilke 45B

Playing Characteristics

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Which is better?

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