^ SOOOOO is is still distorted?

is it all frequencies?
are you feeding the amp a good preamp level signal with a max of 2 to 8 volts
is it just one driver or is it several drivers?
does the driver make any crunchy sounds if you move the cone ?
have you substituted a different amp? (please do so)
is voltage 12v or higher
lots of things can cause this from a broke dick amp to a broke dick speaker to make the distorted noise (you might want to describe the distorted sound a little better
is there a capacitor in the circuit? (take it out, listen, then put it back in)

well it is either your signal, the HU or your speakers that are messing up

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I don't know what your problem is, but I'll bet it's hard to pronounce.