I've got 4 mtx 7510's. I don't know witch way i should face them in a 2009 f150 super cab. For best spl. Can anyone give me any ideas? What about the ports?
I have'nt had a system for a while and i have never installed one in a truck.
Doe's anyone know were i can get a wiring harness?
Thanks!

 

Supercab woofers and ports facing up will generally work best but in pickup your low rumbly bass is hard to get since the cab is too short to fully form those waves. You'll usually hear all them low notes great though standing 10 feet away from your truck.

Also wh focus on SPL with 4 10's. With a good amp you'll allready get louder than your ears will be comfortble with anyways. Focus more on sound quality