Depends on how much space you got in your doors, between door skin and (plastic) door panel and how your grill is/fits/installs.
I'd look for these anwsers in your car-specific forum.
2008 Nissan Altima
Kenwood DNX 5140
Arc Audio IDX and XEQ
Polk Audio SR6500 active and SR124-dvc sealed
Polk Audio PA500.4 and PA1200.1
TV: Philips 42" LCD 1080p
Front Speakers: Polk Audio RT800i
Center Speaker: Polk Audio CS1
Surround Speakers: Polk Audio R50's powered of Denon AVR
Subwoofer: Polk Audio DSW pro500
AVR: Denon 3801
DVD Player: Denon DVM 745 upscale 1080p
Sat: Directtv HD 10
Front Speakers Amp: Rotel RB 890
Center Speaker amp: Rotel 970 BX
If you have the depth,m a jig saw will make it work. I have put 6x9s in the front doors of a Saturn, and have put 10" woofers in the doors of a F150, and needed nothing more than a jigsaw to make the hole.
Comments
I'd look for these anwsers in your car-specific forum.
Kenwood DNX 5140
Arc Audio IDX and XEQ
Polk Audio SR6500 active and SR124-dvc sealed
Polk Audio PA500.4 and PA1200.1
Front Speakers: Polk Audio RT800i
Center Speaker: Polk Audio CS1
Surround Speakers: Polk Audio R50's powered of Denon AVR
Subwoofer: Polk Audio DSW pro500
AVR: Denon 3801
DVD Player: Denon DVM 745 upscale 1080p
Sat: Directtv HD 10
Front Speakers Amp: Rotel RB 890
Center Speaker amp: Rotel 970 BX