Question about Mackie SWA1801 Subwoofer

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Sub plays, distorted and causing speaker flap or fart at higher levels

Found fuse F2 1A on board blown and resistor R73 cooked. I hear this distortion kind of a crackel when I sniff the amp board with a passive hand held amp, this noise goes with the beat of my music input. Replaced input crossover board so I figure its all in the amp.

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