The SVS PC12 Plus' replace a very old SVS PB12 Ultra/2. The old sub was a frickin' monster and made placement very difficult. So far I have noticed more impact and a smoother response. I highly recommend dual subs (or 4 if you have the room).
The subs are sitting on Great Grammas. Aurolex Great Grammas help eliminate unwanted vibrations. Since my house is 60+ years old and my HT sits on a floor above a basement, the subs rattle the hell out of my windows and doors. With the Grammas, the rattling is reduced and can enjoy my subs and a much higher volume.
