Just looking around on the net and I came across Earthquake sws and I was thinking could someone put in the 6.5 inch sub that they make in the back door? 1 3/4" mounting depth now would the magnet be to close or would this work?
Nope, you're good with that depth. I have Polk db650's in my rear doors...top mount depth 2". No window problem whatsoever.You'll need some kind of mounting brackets though or gut the OEM speakers and use those.