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Hey everyone, I just got my o scope and decided to tune my system. First i did the door speakers since they are ran off the HU, and found I have a max volume of 31/50, all the sine waves looked good, went smooth as butter.... then i went to the sub amp, brz1200d, and i have the weirdest thing showing up on the scope. a picture will be below, or a link. i have eliminated the rca's, hu, and almost all factors with this. even with no signal going to it, and just the amp on, no rca's connected, no bass knob, and i still get a feedback.... please help me figure out why this is happening, i dont want to bump my sub till this is figured out.