I think the reason alot of other people are not seeing this problem Is because they're subwoofer probably have built in crossovers. I and running 2 pro sound amp for my sub that do not have them built in. I rely on my 990 to take care of it
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Outlaw 990
Parasound HCA 3500A
Parasound HCA 1500 X2
Parasound CDP 1000
2 CREST AUDIO FA901s (SUB AMPs)
SONY DVP 9000ES
PANAMAX MAX 1500
MONSTER AVS 2000 X2