Bach 9 vs Monette TS11 S1
The Bach 9 has a wider cup diameter, the Bach 9 features a deeper cup.
Mouthpiece A
Bach 9
• Baritone / Euphonium
Cup diameter24.72 mm / 0.9732 in
Cup depthDeep
Rim width—
Throat diameter5.85 mm / 0.2303 in
Backbore—
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
vs
Mouthpiece B
Monette TS11 S1
• Baritone / Euphonium
Cup diameter24.70 mm / 0.9724 in
Cup depthShallow
Rim width—
Throat diameter5.85 mm / 0.2303 in
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Bach 9 has a cup diameter of 24.72 mm / 0.9732 in compared to 24.70 mm / 0.9724 in on the Monette TS11 S1 — a difference of 0.02 mm / 0.0008 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bach 9 has a deep cup while the Monette TS11 S1 has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
Throat diameters are essentially identical at 5.85 mm / 0.2303 in, so resistance feel will be comparable.
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.