Conn Connstellation 9BN vs Giardinelli 17S
The Conn Connstellation 9BN has a wider cup diameter, the Conn Connstellation 9BN features a deeper cup.
Cup Diameter
The Conn Connstellation 9BN has a cup diameter of 15.88 mm / 0.6252 in compared to 15.00 mm / 0.5906 in on the Giardinelli 17S — a difference of 0.88 mm / 0.0346 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Conn Connstellation 9BN has a very deep cup while the Giardinelli 17S has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Material
The Conn Connstellation 9BN is described as Silver-plated brass, and the Giardinelli 17S 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.