Axiom Home Page Forums General Discussion Home Theater Does your EP500 look like this?

An additional thought. What receiver do you have? Many these days have multi-frequency standing wave attenuation. Which can do a better job than the small selection that the trim setting offered. For instance my Pioneer has a Standing Wave portion to it's auto-setup MCACC routine which can measure three locations in the room to find out if any specific frequencies need to be trimmed and by how much. And this is a pretty simple receiver as room-correction features go.