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Distorted or Crackling Sound from Speakers
Burnt voice coils are the most common cause of crackling or distorted speaker sound. This is usually caused by exceeding a speaker's peak power rating. Check that the power output on any connected amplifier's channels are not too high for the peak power or, for best sound quality, the RMS of the speaker being used and that the gain on the amplifier is not set too high. Burnt voice coils can often be smelled, and can also be checked for by applying gentle pressure to the speaker cone to feel if the coil is rubbing or binding.
Check that all wires are secured and tightly connected. Improperly secured wires are prone to movement, causing shorts which can be the cause speaker distortion.
Speakers must be mounted on a flat surface. Mounting speakers to an uneven surface can cause the frames to bend or twist, resulting in restricted movement of the cone. This can cause permanent damage to the speaker.
Lastly, if the speaker was held in place while the holes for the mounting bracket were drilled out, it is very likely that debris from the drilling has fallen into the speaker itself. This can get into the voice coil and cause permanent damage to the speaker.