I continue to see folks bashing Audessey here and elsewhere. To each their own I reckon, but I sure like what it does in my room with my set up. So ya, I agree with Michael, give it a whirl first before you get on the Audessey basher bus. Just make sure you take your time with mic positioning and make sure that you do not have any background noise when doing the set up. After you run it, verify distances and SPL levels. You might also want to change speaker sizes and X-over settings to your liking.
I was running my M80’s with the 3808 and it did just fine. I added a 200X5 amp and didn’t notice a dramatic difference. A wee bit more headroom and slightly improved dynamic range, but it definitely wasn’t a night and day difference.