I talked to a bunch of audio guy's in my area they all said the same thing!
That the stock headunits are indeed restricting signal to the rear speakers
I promptly replaced the pos stock deck with an aftermarket one and have not touched the stock surrounds! they sound great!
scene: Agaudo smashes cockroach to provoke ventura
Agaudo: Homicide!, ventura how you gonna solve that one?
Ventura: Good question Agaudo,first I'd establish a motive..in this case the killer saw the size of the bugs dick and became insanely jealous!