You realize DENON has 10 year old boys writing their manuals ?
Fact is, they have among the worst manuals in the world.
Why would it have 11.2 pre-outs if it can only output 9.1 ?
For preamp output, it has
1) Front L, 2) Front R, 3) Center, 4) Surround L, 5) Surround Right, 6) Surround Back L, 7) Surround Back R, 8) Front Height L, 9) Front Height R, 10) Front Wide L, 11) Front Wide R, Sub1, Sub2.
So it can output 11.2 Ch.