crackling speakers

I just finished an install of 4 new speakers and amp, speakers were alpine components in front and pioneer 6x9's in back. After i installed the fronts, everything sounded great. After i installed the rears, i tested again, this time all 4 speakers had a terrible crackle, even at low volume, it gets worse as the volume increases of course. Setting the gain low doesnt help. Since this install is from a factory amplifier, using a pac-4 lineout converter, i tried a different converter, a cheap one. Same result. I hooked up my amp from my car, an Alpine pdx, and it sounded great... For about 10 min, then the crackle reappeared. It's a little better then the other amp, but still present at modest volume. The power and ground are beyond recomended specs, done right, power through the firewall. Disconnecting any input or output does not resolve the problem. What's going on here? My only guess, is the factory amp is crap, the reason for the install was this same problem with the front left tweeter, which came back even after replacing the speaker. Help please. Thanks in advance.

2005 toyota camry

Is your factory system amplified? Are you using the factory wiring? It sounds like you may be getting interference from the factory amp. Either eliminate the amp or run new wire from your 4 channel to the new speakers.

Not sure what you mean by "crackling," but disconnect the rear speakers one at a time and see which one is causing the issue, then double check that there are no frayed or loose speaker wires and that the speaker is not blown.  Check resistance to ground on the speaker wires.  If all looks good then you have an amplifier or HU issue.Support the12volt.com

Crackling does resemble blown speakers, all are brand new. Ive disconnected all speakers and reconnected them one at a time by themselves and they all have the same issue. Speaker wires at all connections except at the amp are soldered. I do have it connected to the outputs of the factory amp. I was a little wary about eliminating the factory amp, im not sure how the vehicle would react, maybe not allow the hu to turn on at all, just dont know enough about factory amps. If anyone has advise on that, i would prefer to remove the factory amp. I know the amp is good, came directly out of my car, never had problems with it, tomorrow im going to hook up the first amp to my car to see what it sounds like on a known good system. Thanks for the replies.

i had this porblem before. thought my stock speakers were blown but turns out that my wiring to my deck was bad. check ur connection to ur speakers wires check for cut wires n stuff like that. mine was spliced and connection was bad. they way u can tell if u got bad wire going to ur speaker is take out ur stereo deck and try powering ur speaker from back of the deck directly with some extra speaker wires.

there is a bad connection on ur speaker line to ur stereo deck. if on channel from u deck had bad connection like positive and negative touching it can cause all 4 speakers to crackle also..

If you are driving the factory amp with the speaker outputs from your HU that is the problem.  You need to either bypass the factory amp or drive it with line level signals from the HU.  If you ARE using line-level signal to drive the amp, then perhaps you have an impedance issue.  In any case, my best advice is to start by bypassing the factory amp.Support the12volt.com

I just re-read your original post.  What is your HU?  And are you trying to use the factory amp through an LOC to drive an outboard amp?Support the12volt.com

Hu is the camry xle factory navigation unit, i am using the outputs of the factory amp as the input to the loc. I asked around if this was an option, and all replies indicated that it would work. I wasnt happy with that decision, but still wasnt sure about how the car may react if i completely eliminate the factory amp. Im going to use an ipod to supply the sound to the aftermarket amp, and see if the problem goes away, if it does, then i know the problem is on the factory side.