All I know is the 3xxx are classed higher than the 2xxx receivers even if the 3310 is last years model its the better of the two. Like was mentioned above if a mfg won't include pre outs chances are it has a weak pre amp...food for thought?
I love my 3808 and when the time comes to purchase a new receiver (several years down the road) I will likely go with another 3xxx or 4xxx denon model.
The newer 3xxx models appear to be lighter than the older units. Having owned a 3805, I'm sure it weighted about 38lbs....I'm not trying to alarm anyone..just an obersavtion on my part.
They have been making the cases lighter/thinner, using more plastic etc. over the years so going strictly by weight these days means very little, unless it is a huge drop in weight.
Yeah...it makes sense to me now . Looks like the 33xx have replaced the 28xx models...hence the lighter weight with respect to the 38xx series due to their beefer amp section . Now it appears the jump in price from the 33xx to the 43xx is quite large...and IMO the 38xx bridged gap.