My next guess is that room correction is only on Freescale DSP chips.

Another guess is that in the 818/808 architecture there is no (spare?) Freescale based processing power for room correction, but instead implemented a mini RC on the xCORE chips in 818. This has also filtered to other xCORE based products thus justified the development effort. Now that xCORE is mandatory in the latest reference products by virtue of the USB input card, I can see that chip being utilised for more standard functions that the Freescale chips may previously have handled.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).