I have never heard any discussions on how Audyssey effects the LFE channel, but I have heard about it causing the center channel to be difficult to hear when enabled. Some of this might have to do with your room and the calculations that Audyssey does, as well. As for me with my 3808, it's an excellent AVR and I have been nothing but thrilled with it. Given the range you are looking are looking in, in terms of AVRs, I would certainly go with the Denon over the Onkyo....and if you can squeeze it out go for the 2809ci as that gives you the new GUI (which is great), added power, as well as some other useful features...