I'd be scared to put all that equipment in my Kia and trash it in a bad road. I have a simple JVC MP3 radio 50Wx4 with 6.5" coaxial Jensen speakers in the front and two 10" boxed speakers in the rear and this thing rocks. I used to add amplifiers to my systems, but I got tired of dealing with a bunch of wires and noises coming from all different parts of my radio system. I admire those who like to tangle the sound properties of a good sound system, but I just gave up. My wife does have the goodies, amplifiers and all, but she does not go off-road. Still, let me ask this question, I have a couple of really good Yamaha boxed speakers 6ohm's, they are not too big. I was wondering, if I used them, is there a chance I would fry my stereo output amplifiers. I know the front speakers are 8ohms (I think).