I'm designing a basic audio system for my car and would like your opinions on my speaker setup. Everything will be high quality brands.Front: 5-1/4" ComponentsRear : 6-1/2" Midbass Woofers (not coaxials)Subs : Two 12" Subwoofers Sealed EnclosureI have a 100Wx2 stereo amp for the fronts and a 200W Mono Amp for the rears. What do you guys (or gals) think about using the 6-1/2s in the back and powering them with a mono amp? Sounds like a good idea to me but I've never done it. Thanks