Yep John, I was aware of that also. The problem is my 600 was purchased prior to this change, and it has the brickwall filter. My graphs show a drop off above 100hz with just the one sub, and I was thinking by purchasing some 350's to place along some of the other walls, it might help flatten the entire room response for all listening positions. The 350's go up to 150 it appears.

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