Well the earth feels like its going to open up and a tripod rise out of the floor. Other than that alot of low bass vibrating the viewers. Actually the four subs together are calibrated to just 1 or 2 db over 75db reference so its not much louder than where you probably have your Hsu set. Its just very distinct and clean sounding, well articulated really is how I describe it without any noticable artifacts.

The Axiom service was just outstanding by the way with their guidance and assistance!

John