I have installed the 4" focals that people have seemed to be upgrading to...and honestly, there's just not enough low & low/mid extension for my personal tastes...

Has anyone tried installing a 6" speaker in that same space?
Something like the MB Quarts:

http://www.mbquart.com/mbquart_reference_speakers.html

That 6x9 looks really nice if it'll fit, as you can also tilt the tweeter towards you.

I took these pics from user VERGIS's post in his "upgrading standard door speakers" post
https://www.6speedonline.com/forums/...-speakers.html

Can anyone chime in?

I REALLY don't want to cut a whole in the bottom of the door to create a new space.

Best,
Jeff