Which Apex Diaphragm is Right for Me?
The Apex Series Sampler comes with three dome options to accommodate different soft palate shapes:
Pinnacle: For callers with a deep palate.
Vertex: For callers with a medium palate depth who prefer a flat style dome.
Summit: For callers who prefer a diaphragm without any dome at all. It provides clearance for a shallow palate and offers more consistency and control to note transitions than standard flat frames.

By trying out the different domes in the sampler, you can find the one that best fits your soft palate and calling style.
Pinnacle 2: Medium Build = Medium Air Pressure
Summit 2: Medium Build = Medium Air Pressure 
Vertex 2: Medium Build = Medium Air Pressure