'98 Grand Prix rear 6x9 speaker replacement

I have a '98 grand prix gt. I replaced the factory 6x9 rear speakers with a pair of Sony Xplod 3-way speakers. I'm still getting poor sound even with the new 6x9s. Should I replace the 4" mid-range speakers two? Should I get diffrent 6x9s or a diffrent amp? Not sure what to do, any help would be great!!!!

what kind of head unit do u have?? that could be the problem...my stepbrother has a 95 neon and he replaced the rear speakers wit the Xplod 2 wayz and when he has it on both back speakers, it soundz like crap...but when he puts it mostly on one rear speaker...its soundz betta than mine...n i got Lightning Audio 6x9z...n they put out decent sound...

sony = crap!

Infinity would be better...even the low end Infinity

yea...infinity'z very good...but if u run bigger wires than factory...most aftermarket speakers that are decent sound even better...i kno bcuz i just ran new wires to my back speakers...went from about 20-gauge wire to 16-gauge wire

o and i noticed that if u have 2 different size wire groupz goin back to da rear speakers it soundz like crap...when i waz replacin da wires...i tested out the sound with only 1 set of wires ran and it sounded just like my stepbrothers...when both had the same amount of power goin to them, it sounded like shyt...but if i put it on one or the other, it sounded good...the one with the new wire even better...

sony = crap! x 2

What head unit are u running??

I have a 98 coupe that only has the 4 speaker system and I'm pretty happy it.

Alpine head unit
Fosgate amp
Kicker Solo barics
Stock front and rear

hrmm thats wierd for you. i blew one my stock 6x9s so i replaced em with 2way pioneers and it sounded much better. and i still have the stock HU and im running a 12" MTX sub too. but im gonna upgrade HU then new sub system. .... hrmm .. maybe u need a new headunit.

I still have the factory HU. I think I'm going to have to get a new amp. and wiring.

I would like to keep the factory HU, so I don't lose my steering wheel controls and 12cd changer.

oh so u have the boss system?