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can mean several things. The crackle is subjective and can mean distortion. Distortion most of the time comes out of the amplifier. Could be you have blown a capacitor in the power supply of the amplifier, making it work with quasi half the voltage. There is no need to change the polarity on a speaker, because when one is not working infuse, it won't distort the music. You only could have difficulty with the stereo sound. It could be a bit unclear where the sound is coming from and could sound a little less powerful.Check the speakers on a different amplifier, to hear if I'm right. Only if you switched on sound while the amp was giving full power, you could have blown the speakers, but most of the time they don't give any noise after that.
distorted sound sometimes accompanied by buzzing is caused by detuned circuit in the SIF amplifier and sound detector circuit. a distorted sound alone is caused by a breakdown in AF amplifier circuit so try to change the sound ic since its the only options left. good luck!
It's not bad, but at 400 watts, it's a bit underpowered It'll be plenty loud, but the amp will distort before the speakers do, particularly if your subs are wired in parallel (as dual-driver boxes are typically wired)
Listen for distortion, and turn it down a bit if the sound gets fuzzy or static-y sounding
All inputs are switched and go through a series of amplification stages. If the volume appears to change correctly, but hte sound is just distorted independent of the voluem, then the problem is likely to be in the beginning stages of the amp. This can be as simple as a defective OpAmp IC or diff-amp section or even a voltage regulator failure. Without the exact model number and some internal measurements, I can not say for sure. Can you supply more details?