Bob Reeves 43.5/SV/692sL vs Yamaha TR-14B4
The Bob Reeves 43.5/SV/692sL has a wider cup diameter.
Mouthpiece A
Bob Reeves 43.5/SV/692sL
• Trumpet
Cup diameter17.26 mm / 0.6795 in
Cup depthShallow
Rim width—
Throat diameter—
Backbore692sL
Finish—
Material—
vs
Mouthpiece B
Yamaha TR-14B4
• Trumpet
Cup diameter16.85 mm / 0.6634 in
Cup depthShallow
Rim width—
Throat diameter3.65 mm / 0.1437 in
BackboreSemi-narrow
Finish—
Material—
Cup Diameter
The Bob Reeves 43.5/SV/692sL has a cup diameter of 17.26 mm / 0.6795 in compared to 16.85 mm / 0.6634 in on the Yamaha TR-14B4 — a difference of 0.41 mm / 0.0161 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a shallow cup depth, so the sound character from depth alone will be very similar.
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.