have you contacted Outlaw Audio about the problem? I'd be concerned that it may be damaging something.. since most of the rest of us don't have this kind of distortion.. it would bug me till i got it resolved.

are you sure it's not the 7125 amp and not the 990?
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Outlaw Audio 990 pre amp
Adire Audio sub (SVS 12.2 driver)
CAL Alpha tube DAC
Parasound P/HP-850 2 CH pre
Pioneer PL-530 TT
Polk Audio SDA 2B
NAD 2600A amp
Danger Boy here