I have a 2805 and it works great. Most receivers only have 1 sub LFE out jack, you can daisy chain the subs togethor:

receiver - sub out jack - sub 1 - sub2 - sub 3 (the sub channel is a mono channel.

or you can put a splitter or y cable on the single sub out and run 2, 3, etc. lines off of that...

Are you planning on getting a different receiver, the 2805 is getting dated..

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