Okay, your last post gives a clue: if you get reasonable output using the "LFE" input(which bypasses the sub's internal low-pass filter), that indicates that the internal filter may be defective or the setting inaccurate. If by "60 degrees" you meant that you set it at 60Hz, that may be shutting off everything but the very lowest rumbles(which is actually what a sub sounds like; in no way are they "musical"), so try higher settings on the sub low-pass filter.

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Enjoy the music, not the equipment.