Elevating subwoofer about two feet off the floor

This should not be surprising; smashing a wave into the floor is never optimum. 

I have been using the ASC sub trap for many years. If you own a sub, you owe it to yourself to try one out...I did, and have never looked back. I feel raising the sub off the floor a few feet gives the sub a much better chance of integrating the low frequency's into the room,a more vertical distribution if you will...away from the room boundary of the floor itself,giving a tighter presentation overall.

With the bass trap centered at 70 Hz,the sub also has a chance of being heard without buildup of room modes. A win win if there ever was one.

It was all I could do to move my pair of JL Audio F113V2's around at all, interesting concept, elevating subs.  The JL Audio's and Velodyne's all have microphones and EQ routines, to "tune" them to the room (I imagine also taking into account the reflections off the floor).  I don't see why one of these wouldn't "tune" properly if elevated.

In my case the room had all sorts of "non-musical" resonances, after installing ten bass traps (with the help of a calibration microphone, and the Room EQ Wizard software) I finally got the subs "dialed in" to the room.

Bass traps are not for everyone...have a very low WAF rating...

hey ejr1953,

Thanks for the tip about Room EQ Wizard.