Not sure if this is it, but how close to your TV is the Sub? The reason I ask is when reading the product information on the subs, I don't see where they are Magnetically (Video) Shielded like the other Axiom speakers? Have you tried moving the sub farther away from the TV.

Just and idea, maybe I don't know what I'm talking about, the other Axiomites will let me know

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85