[GUITAR1989]

Hey guys Im planning on wiring up my sound system tomarrow and I just wanna make sure Im not missing anything. When I bought my truck it had an old tape deck and thats it....I went out and bought a Pioneer DEH-3200UB along with some Pioneer ts-g1644r 40 watt rms, 4 ohm, 6 1/2 and a 250 watt, 8 ohm, 10 inch renegade sub. My stepbrother had a Sound Storm 2f1600 2 chanel amp. I wanted to try and wire all that up off of the amp and the manual has a diagram for 2 speakers and a sub to be wired up but when I went to a local audio store they guy advised me not to wire up all 3 because I wouldnt be able to fine tune the speakers and amp seperatly. Is this true or is there any way I can wire up all 3 and still be able to adjust the sub and speaker frequencies separate from eachother? also will the ohm's be fine with this set up or do I have to wire it some weird way for the amp to be ok?
any more info you need on the set up just ask and ill post it up for you