i wanted to add the SWS to my promedia long ago. But klipsch just does't wanna produce a 230V SWS. Just added a YST-SW015 yesterday, although it uses a 6.5" driver, it can easily hits 30Hz, it's simpily awesome. I tried turning off the promedia's sub and let the yamaha takes over, it sounds alot better than the past when i only have the promedia's sub running. Maybe because i corner loaded it. yamaha used Quatre Dispersion Bass(QD-bass) technology in this sub, therefor enables the bass to be reflected off the wall 360 degress around it. After all, the both of them works together most of the time