Sounds like what Denon did with the number change up, the 3310 replaces the lower 2809 and the 4310 replaced the 3808 but the prices are not the same. The 4310 is now in the 4308 price range and the 3310 took the 3808 price point meaning slightly less quality for the same money \:\( .

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70