Sounds more like the speaker is shorting out. If you disconect one side and it still works then it must be getting a ground from the chassis. I would take it back to Circuit City and have them fix it.......Woops just read again....Um, Maybe you can bring it to circuit city with everything connected and tell them the stereo went out and see what they find. Kind of leave out the part about your new speakers until you really have to tell them that its all your fault the system isn't working
Older audio systems use the cars chasis for ground and only run one wire back to each speaker. If this is the case then you may need to run new speaker wires to the back of the car.
You may also just flip the back wires to the speaker. to see if that fixes it. Could be that when you replaced the speakers you put - on + and + on -. Then on top of that audio ground is connected to chasis ground......I dont know.
Check wiring, Flip wires. Pull one over on circuit city
