Randy,

Can you draw is a picture and then make reference to the coax that you are talking about?

eg. denon--600--350--350

I can tell you right now that even with my 600 unplugged, I can't daisy-chain another sub with the 600 without losing a considerable amount of gain from that sub. The amp has a high input impedance.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated