Conn Precision 3A vs Yamaha SL-48S-GP
the Conn Precision 3A features a deeper cup.
Mouthpiece A
Conn Precision 3A
• Trombone
GeneralCup diameter—
Cup depth
Rim width—
Throat diameter—
Backbore—
Finish—
MaterialSilver-plated brass
Best suited for
General trombone use
Good round tone in all registers; all-around
vs
Mouthpiece B
Yamaha SL-48S-GP
• Trombone
Cup diameter25.25 mm / 0.9941 in
Cup depthMedium
Rim width—
Throat diameter6.62 mm / 0.2606 in
BackboreSemi-wide
Finish—
Material—
Best suited for
High-volume projection — open throat for power
Cup Depth
The Conn Precision 3A has a — cup while the Yamaha SL-48S-GP has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Material
The Conn Precision 3A is described as Silver-plated brass, and the Yamaha SL-48S-GP as unspecified. 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.