Bach Mega Tone Trombone 6½A vs Schilke 53
The Schilke 53 has a wider cup diameter, the Bach Mega Tone Trombone 6½A features a deeper cup, the Schilke 53 has a larger throat opening.
Cup Diameter
The Schilke 53 has a cup diameter of 26.24 mm / 1.0331 in compared to 25.40 mm / 1.0000 in on the Bach Mega Tone Trombone 6½A — a difference of 0.84 mm / 0.0331 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bach Mega Tone Trombone 6½A has a deep cup while the Schilke 53 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Schilke 53 has a wider throat (5.95 mm / 0.2343 in vs 5.85 mm / 0.2303 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.
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.