Here is my situation, I have the denon 1804 rated at 90x6, power consumption 4.5A (540 watts). I use it as 5.1 only. I have been getting the upgrade itch lately and my 1804 does not have pre-outs. I have looked at the 2805 but more at the 3805 as an upgrade. $1600 Canadian is alot of coin and I could offset it a little by selling my 1804 to a buddy. But then I started thinking how can I keep my 1804 and beat the performance of the 3805 without spending $1600. This is what a came up with so tell me if this is do-able. Get the lesser denon 2105 and use that for my front three channels and use the pre-outs from the 2105 to the 1804 and use the 1804 to power my two di-pole surrounds. This is the way I see it (not looking at the audio watts numbers), the 2105 has a power consumption of 5.3A (636watts) and the 1804 has 4.5A (540watts) for a total of 9.8A max power consumption. The 3805 has a max of 7.1A. Can this set-up work, what exactly would I need to do to hook the two amps together, would I have to always use both master volumes (that would be a pain in the @$$), and would this set-up make the 3805 sound less powerful. Thanks for any replies. All this is just food for thought, I don't want to upgrade if it is not worth it.