You have to disable the Sony sound processing to get good sound out of our system. It's not the speakers holding back the quality it's the BS Sony sound processing... Once disabled, the stock speakers even sound much better. Full sound without trying to tweak the EQ now, sounds good! As far as speakers for our car, I suggest using Crutchfield and using the "what fits my car" tool... With different mounting depth requirements, there are more that fit the rear than front, but I suggest going with a full 6.75" to get the best bass and Crutchfield includes all adapters necessary too for quite often the same price as Amazon. You also want to make sure to pick a speaker that has a low minimum RMS wattage and a high sensitivity rating. There used to be a bigger selection but right now there are some Kicker 6 3/4" for $65 or step up to some Rockford Fosgate components for $99 where you mount the tweeter in the stock location with a bit of work. Forthe rear, with more mounting depth, there is even a lower end Rockford Fosgate 6 3/4" for only $40 that has low minimum wattage and a decent 91db sensitivity to get good sound out of the rears. Since I do swap tunes around in my car a lot where the EQ and fade gets reset, I do fade to the rear 2 notches, even with stock speakers and Sony sound disabled. So in this case, replacing the rear speakers with the ones for $40, they hit down to 52Hz, claimed anyway, while the $65 step up model mentioned above that fits front and rear hits down to 40Hz, which is a pretty good start in maxing out the stock speaker locations.