yea, possibly....although you might damage your front speakers...so i would recommend you turn the gains down to the front speakers. However, if your front spekers are the dodgy vauxhall ones then i wouldnt bother amping them, infact, your fronts are only 40wRMS and your HU is prolly giving out 22-30wRMS (not 45w, thats the peak) so there probably wouldnt be a point.
Just get a 2 channel 100wRMS amp for your 6x9's and leave it as that :)

Dom

Do you mean a 4-channel amp 100w rms amp and run the 6x9s and front speakers, one off each channel? Would that be the best option then yeh

nah mate, leave the standard vauxhall rears....there shockingly shite :lol:
As for the amp, you could get a 100wRMS amp and turn the gains right down for the front, but the other 2 channels for ya 6x9's, leave them up :)
Although it would be best to get a 2channel amp for ya 6x9's, then get another for your front speakers (if there worth amping, good make/SQ etc) :)

Dom

Ive currently got a pair of 100w rms 6x9s in the parcel shelf and a pair or front speakers of about 40w rms. Whats the best way of setting this up? Should i get a 2 channel amp of around 100w rms and wire each channel to one of my 6x9s and leave the two front speakers running off my Pioneer DEH-P6000r Head Unit (4x45w) or is there some other better way of doin it? Also, if i did it this way it have 2 free channels from the head unit so would it be a good idea to wire the 2 free head unit channels to run the two standard vauxhall rear speakers? Thanx guys