Conn Imp. Precision 4 vs Yamaha SL-48L-GP
the Conn Imp. Precision 4 features a deeper cup.
Mouthpiece A
Conn Imp. Precision 4
• Trombone
OrchestralCup diameter—
Cup depth
Rim width—
Throat diameter—
Backbore—
Finish—
MaterialSilver-plated brass
Best suited for
Bass trombone / large bore tenor
Full rich deep tone
vs
Mouthpiece B
Yamaha SL-48L-GP
• Trombone
Cup diameter25.25 mm / 0.9941 in
Cup depthMedium
Rim width—
Throat diameter6.62 mm / 0.2606 in
BackboreSemi-narrow
Finish—
Material—
Best suited for
High-volume projection — open throat for power
Cup Depth
The Conn Imp. Precision 4 has a — cup while the Yamaha SL-48L-GP 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 Yamaha SL-48L-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.