Left speaker makes a crackling noise?

Speaker crackling when engine is on? NEW INFO please help?

• hi. i have been having a weird sound coming out of one of the speakers in my camaro's stereo system. it is coming from the rear right mqin speaker behing the passenger seat. it sounds like a kind of metallic crackling sound. it is very faint, and you kinda have to know its there to hear it. this only happens with the engine running, never with it off it also happens more or less with tone/pitch sort of. volume might have an effect, but it will still craxkle with the stereo on with the volume at 0. finally, cd vs radio has noneffect. when i turn the stereo off with the engine on, the noise stops. unfortunately i drive the car almost exclusively of short trips, 4 miles about. i also sometimes will sit in the car, engine off, and listen to the stereo at very low volume. is it possible that the noise is 'rough' current flow coming from a hard pressed alternator? the car has an aftermarket stereo system. head unit, amp, subwoofer, and i think speakers (they are still in the origional cover, but they are far louder than i can imagime the stock ones were. the amp is 800 watts, and i know the sub is too small for that power, it it helps. it looks like the stereo shop oversold the previous owner, the guy who put the system in. the system was professionally installed. anyone have any ideas of cause and what to do? NEW INFO... the car is a 96 camaro rs v6. also, the crackling sound can be heard when the engine is on or off when electrical load is added or taken away. it is for a split second while the circuit is 'half on' if that makes some sense. an example is while sitting with the engine off, the same speaker makes the weird click/crackle sound when the headlights are turned on or off, or the turn signal is engaged or disengaged, cigatette lighter, etc. thanks a ton

• Answer:

  you sir have a blown speaker. I just threw all my stock speakers for my camaro away also or else i would just give it to you. those speakers in the rear seat area are mid drivers if you have the monsoon system. You will have to buy a oem speaker for it to sound and work correctly or else you will have to rewire the car since the factory amp isn't really compatible with aftermarket speakers.