Which has a bigger cup — Bach 1B or Bob Reeves 43W/D/X?

The Bob Reeves 43W/D/X has a cup diameter of 17.07 mm / 0.6720 in compared to 17.00 mm / 0.6693 in on the Bach 1B — a difference of 0.07 mm / 0.0028 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 1B and Bob Reeves 43W/D/X?

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

Bach 1B vs Bob Reeves 43W/D/X

Name: Bob Reeves 43W/D/X
Brand: Bob Reeves

The Bob Reeves 43W/D/X has a wider cup diameter.

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 1B

• Cornet

Rim width—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

Mouthpiece B

Bob Reeves 43W/D/X

• Cornet

Rim width—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

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 1B details Bob Reeves 43W/D/X details Bach 1B equivalents Bob Reeves 43W/D/X equivalents

Bach 1B vs Bob Reeves 43W/D/X

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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