Bach 2½C vs Conn Imp. Precision 5
the Bach 2½C features a deeper cup.
Mouthpiece A
Bach 2½C
• Cornet
Cup diameter16.40 mm / 0.6457 in
Cup depthMedium
Rim width—
Throat diameter3.66 mm / 0.1441 in
Backbore—
Finish—
Material—
Best suited for
All-round versatile — balanced cup for general playing
vs
Mouthpiece B
Conn Imp. Precision 5
• Cornet
LeadCup diameter—
Cup depthShallow
Rim width—
Throat diameter—
Backbore—
Finish—
MaterialSilver-plated brass
Best suited for
Dance band / lead; standard on Conn 6B Victor
Bright tone; excellent in high register
Cup Depth
The Bach 2½C has a medium cup while the Conn Imp. Precision 5 has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Material
The Bach 2½C is described as unspecified, and the Conn Imp. Precision 5 as Silver-plated brass. Material affects mass, warmth, and how quickly the piece responds.
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.