hi there, my sister and brother-in-law just got a 94 passport. i looked up what fit at crutchfield and they said 4" on the dash and in the rear panel. are there any decent coax 4" that have some volume and some decent sound off a aftermarket deck. they aren't addicts like i am, they just want something that sounds better than what they have, which is 1 of 4 speakers playing. anyway, just wondering if anybody has experience with this vehicle. thanks in advance