Bach Mega Tone 1 vs Kelly SYMPHONIC
The Kelly SYMPHONIC has a wider cup diameter, the Kelly SYMPHONIC features a deeper cup, the Kelly SYMPHONIC has a larger throat opening.
Cup Diameter
The Kelly SYMPHONIC has a cup diameter of 17.53 mm / 0.6902 in compared to 17.50 mm / 0.6890 in on the Bach Mega Tone 1 — a difference of 0.03 mm / 0.0012 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Kelly SYMPHONIC has a — cup while the Bach Mega Tone 1 has a very deep cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Kelly SYMPHONIC has a wider throat (4.37 mm / 0.1720 in vs 3.73 mm / 0.1469 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.
Material
The Bach Mega Tone 1 is described as unspecified, and the Kelly SYMPHONIC as Lexan polycarbonate. 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.