off all the processors I've ever used.. the 990 is the toughest to correctly dial in the subwoofer to proper levels.

Once set up... it's ok. But i've spent more time dailing in the sub than i ever have before.
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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