> Yes I did not use the plastic surround at all, just the metal grille part.
> When I was installing the 4" speakers it didn't look like there was much
> room for a larger speaker.  I guess I could cut the door sheet metal to

My 4" Alpines seem to have quite a bit of room behind.  I think I measured
at least 5" of space.  I'm pretty sure the backside of 5.25" should fit.  I
was thinking a 6.5" might even work, but I've spoken to someone else that
said it required some cutting.

> install a larger speaker.  I have not yet looked, but would it be required
> to cut metal to install a speaker near the bottom of the door?  There just
> seemed to be a lot going on up top.

Assuming you keep the map pocket, and the speaker is below it, I think you
would have to cut the door metal a bit.

> I was thinking I could use a passive crossover network and just add
> another speaker.  The 4" (and coaxial tweeter) would do say 800 hz and up
> and the 6.5" would do below that to maybe 100 hz.  I would use a fairly
> inexpensive 6.5" speaker as it would only operate from 100-1000 hz.  So
> this would be sort of a 3-way system.

Yeah that seems like it would work pretty well.  The one nice thing about
the components is separate tweeter placement.  But since you already have
the 4" coaxials, adding a 6.5" seems like a pretty simple way to go.

James
90 Carat