Conn Connstellation 7BN vs Conn Precision 2
The Conn Connstellation 7BN has a wider cup diameter, the Conn Precision 2 features a deeper cup.
Cup Diameter
The Conn Connstellation 7BN has a cup diameter of 16.42 mm / 0.6465 in compared to 16.41 mm / 0.6461 in on the Conn Precision 2 — a difference of 0.01 mm / 0.0004 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Conn Precision 2 has a — cup while the Conn Connstellation 7BN has a very deep 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?
Both mouthpieces are categorized as "General" — the physical dimensions above will determine which suits your embouchure and playing style better.