Conn Connstellation 9BN vs Conn Precision 3
The Conn Precision 3 has a wider cup diameter, the Conn Connstellation 9BN features a deeper cup.
Cup Diameter
The Conn Precision 3 has a cup diameter of 16.41 mm / 0.6461 in compared to 15.88 mm / 0.6252 in on the Conn Connstellation 9BN — a difference of 0.53 mm / 0.0209 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 Conn Precision 3 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Material
Both mouthpieces share the same listed material (Silver-plated brass).
Which is better?
The Conn Connstellation 9BN is designed for lead playing, while the Conn Precision 3 targets general use. Your best choice depends on your musical context.