If i remember correctly Bren, i have a friend of a friend here in town who owns some extremely rare 30" drivers which he has housed in some home built concrete cabinets.
I'm hoping to get a picture at some point.
Apparently with only a 5 watt monoblock driving each (or something to that effect), just turning on the amps creates a wave of sound energy so low that the hairs on your arm stand up.
It has been awhile since we chatted about this system of his so i will try to get more information and details for the curious.
