I use to have 3.5 speaker in the dash but the sound was really muffled by the dash. I put 6.5 in the bottom front corners of the doors. they sound great, they pump alot louder than the 3.5. I have a custom deluxe so i dont have side panels in the rear so i mounted two 220 w kenwood 6X9's on the wheel wells . I have 2 6.5" infintiy in the doors with a sony 40wx4 cd/md player pumpin the juice. It aint a high dollar rig, but it sure does play some loud a$$ Lynyrd Skynyrd.