Conn Imp. Precision 4 vs Kelly 25
the Conn Imp. Precision 4 features a deeper cup.
Mouthpiece A
Conn Imp. Precision 4
• Tuba
GeneralCup diameter—
Cup depthDeep
Rim width—
Throat diameter—
Backbore—
Finish—
MaterialSilver-plated brass
Best suited for
Small Eb bass
Full rich tone
vs
Mouthpiece B
Kelly 25
• Tuba
GeneralCup diameter30.99 mm / 1.2201 in
Cup depthMedium
Rim width—
Throat diameter—
BackboreM
Finish—
MaterialLexan polycarbonate
Best suited for
General tuba / euphonium doubler
Cup Depth
The Conn Imp. Precision 4 has a deep cup while the Kelly 25 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Material
The Conn Imp. Precision 4 is described as Silver-plated brass, and the Kelly 25 as Lexan polycarbonate. Material affects mass, warmth, and how quickly the piece responds.
Which is better?
Both mouthpieces are categorized as "General" — the physical dimensions above will determine which suits your embouchure and playing style better.