Yep...I am indeed using the Sony 150W sub that just won't die. I thought I killed it when I was doing head-to-head comparisons with the 600. It smelled like it was cooking and I bottomed out the motor so bad I thought it would come shooting out the port in the back \:\) . But it's still rocking...because it wasn't designed by Sony.

It sounds just awesome for this application in my 1000 cubic foot office.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated