[Nellgrove]

That's fully correct. As xbmc does the "scaling" from "Full" to "Limited" for you (with that setting turned on). There is though a usecase when this does not work. For example some AVRs (Marantz NR1402) only accept "limited range", when you put 0..255 through it, it will clamp byself _again_ which is a big problem. In that cause, you only can drive X11 in limited mode and _don_t enable the xbmc limited mode setting (would scale twice again).

It's not that easy - but also not too hard :-)

In this example given for the Marantz would I add xrandr as "Limited 16:235" rather than full and not enable the limited mode setting?

Trying this with a Denon from a couple of years back (which does not seem to pass full range RGB) I'm seeing 19+ on the 709HD download calibration when I should be able to set it to 17+. This is limiting the amount of shadow detail I see on darker scenes. Have tried both hardware and software decode.

Has anyone had any joy getting older Marantz or Denon receivers to the correct RGB level?

I'm running openelec with the I3 and get the full black levels connecting direct to the Sony LCD.