Which has a bigger cup — Bach 12E or Bob Reeves CV?

The Bob Reeves CV has a cup diameter of 29.50 mm / 1.1614 in compared to 24.50 mm / 0.9646 in on the Bach 12E — a difference of 5.00 mm / 0.1969 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 12E and Bob Reeves CV?

The Bob Reeves CV has a very deep cup while the Bach 12E has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 12E vs Bob Reeves CV

Name: Bob Reeves CV
Brand: Bob Reeves

The Bob Reeves CV has a wider cup diameter, the Bob Reeves CV features a deeper cup.

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 12E

• Trombone

Throat diameter5.85 mm / 0.2303 in

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Bob Reeves CV

• Trombone

Throat diameter—

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 12E details Bob Reeves CV details Bach 12E equivalents Bob Reeves CV equivalents

Bach 12E vs Bob Reeves CV

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