- Dec 28, 2018
Or you might recognize how that ear canal shape and size affect IEM perceived sound--much like room size and shape--to much more of an extent than over ear headphones.
The er4s needs 13khz canal resonance. And it's designed to utilize it. Too shallow you get 8k peak 12-13k dip. Too deep you get 8k dip. It's tunable basically.