This reminds me of the kids game I SPY.
I SPY those Front Wide speaker posts on the 3311 now.
However, I do not SPY any Front Wide or Front Height on the AVR-4310, that is not even an option.
So if you absolutely need the Wide & Height, you better get the 3312 or 4311.
The 4311 actually has Pre-outs to ext amps for the Front Wide and Heights, which I've never seen before.
The 3312 has the speaker posts for the Wide and Height, but no pre-outs.