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Set the HU till you hear distortion, then back it off a bit. Make sure the amp levels are pretty low for this. Then turn the gains up on the amp till they distort, or it gets too damn loud, and back them off a bit.
Obviously set low and high pass according to what the speakers that you are running can handle. If running full bandwidth speakers or using a passive crossover, set the amp slightly lower than the crossover, in high pass mode of course.
That'll get you in the ballpark. Then just tweak around with it, set the high pass higher/lower, see if it changes more or less to your liking. Then you get to do it all over again when you get the sub! YAY!
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