if your amp is black in color, sounds like what I have. I daisy chain my 2 350's. Receiver LFE out to linein sub1, then lineout sub1 to line in Sub2. Of course I calibrate each one of them seperately to the same dB's and then combine them.

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