if you've wired them up to the rear speakers with the rears still running then that'll make them crackle, had this problem with my mates car. you need to either have one or the other running, you cant run both sets of speakers off the same wires on the headunit as you'll only be running about 20watts to each speaker. which is awful and will cut the quality dramatically. if its not, check that on your head unit your grounds havent blown. actually. checky your polarity first. swap the wires around i.e. posative and negative. swap them because if they were round the wrong way then they'll cause a crackling noise!
if you've wired them up to the rear speakers with the rears still running then that'll make them crackle
No it won't....
you cant run both sets of speakers off the same wires on the headunit as you'll only be running about 20watts to each speaker
Sorry, wrong again....Overall impedance is the issue with this scenario....
check that on your head unit your grounds havent blown
This would affect every output channel, not just the 6x9s....
checky your polarity first. swap the wires around i.e. posative and negative. swap them because if they were round the wrong way then they'll cause a crackling noise
Sorry, wrong yet again....Reversing, 'polarity' as you call it, would simply alter the 'phasing' of each speaker....
Because the issue only arises whilst the 6x9s are in use it must be an issue with either these speakers or their wiring, (obviously lol)....
Most instances of speaker 'crackle' occur due to one, or both speaker terminals shorting to ground....I assume these 6x9s are shelf mounted so the instance of shorting to ground is unlikely....The next most likely culprit would be a short between either the speaker terminals or the speaker cables themselves, (check for stray copper strands around any terminals or joins).....
Without knowing exactly how you've wired your 6x9s, or indeed how your actually driving them, all the above are simply 'best guesses'....
It's fair to say that if your running 2 stereo pairs from the rear channels of your Head Unit then low impedance coupled with low output power could indeed be inducing 'clip' at lower volume levels....If this is the case then you should understand that your speakers won't last too long....
Posting up all relevant info will make diagnosis much easier....
