Originally Posted by MetaX
Ah thanks for the info and the link! Now I am seriously thinking about upgrading the in-floor subs with the Earthquake SWS's and stringing a dedicated amp to them. Just need to see if I can find a good spot for the amp and determine how much interior surgery will be needed. I didn't mind taking apart the interior of my old civic to run wires and such but with the X3 I am reluctant to tinker. It would be awesome if the stock amp were capable of driving the Earthquakes but that would be an unrealistic hope.
Imho - putting earthquakes is not worth the effort for the difference in sound quality.
I experimented with me 118i years ago and was uninspired.