Ahhh. Remember this poor thread.
So after setting the speakers to "large" I was quite happy. But being afflicted with bad upgraditis I was planning to get a pair of M80s anyhow and even though Alan (thanks!
) told me the Denon 3805 would drive them very nicely I sort of kept my eye opened for a decent 2-channel amp for them.
As fate would have it I managed to pick up a NAD C272 for a very good price ($500) and while waiting (and dithering on ordering) on M80s I hooked up the amp to my current NHT SB3s.
So... THAT's where the bass and smoothness went. Hawly smoot! I had no idea a separate amp could make so much difference. I had no idea the Denon was so lacking (it isn't really, just doesn't do the same things as the NAD I guess). Wow.
I'm sure other amps do the same good job as the NAD but for those who haven't tried and are working solely with an AVR - however good - I have to say it's a real eye-opener.