I have had the Earthquake SWS-8X's sitting ready for install for some time and finally got round to it. They dropped right in - no dremmel work was required ie there are no protrusions in my housing like in the example threads on this topic. Just for the heck of it I ran them from the standard head unit but no good - even with maximum bass boost in the head unit. They are 4 ohm like the 6 inchers I removed but sensitivity is way down as I kinda expected.
So I installed the Focal Solid 2 amp I had also bought. Cripes what a difference. I have a good hint now what is possible. The Focal is running at near minimum gain and low pass filtered at 150Hz seems the best balance to date. I need to listen to the new setup for a while - see what else needs to be done.
VW Touareg V6 TDI 4Motion
X3 3.0d 2006 (MY07) being sold