Re: two questions regarding Sierra 2ex speakers
I've not used Dirac but have used Anthem's ARC (and now ARC Genesis) for some time now. Genesis does an excellent job of correcting the room and integrating subs and is "tweakable" in professional mode (cross-overs, levels, roll-off, etc.). If you are on AVS Forum, there is a member there (Yonettes) who will work with you to review & modify your ARC file - free of charge - to get the most out of your room/system. He's done 1000's of files and everyone, myself included, has been extremely positive of the improvements.
Aside from the ARC software, the units sound terrific. The WebUI is well laid out and makes set up pretty easy. You can also save your configuration, both on the unit and to a PC. Also has the capability for 30 virtual inputs.
* LG OLED65E6P, BenqHT2050A
* Anthem AVM90, Rogue ST100, VTV Pascal 7 ch
* Sierra Towers/Horizon (all ELX RAAL), S2EXv2 surrounds, HTM200SEx4 heights, Rythmik E15HPx2
* VPI Classic 1+ (VTA & Fatboy Gimbal), PE Eagle/RR, VAS NOVA, Soundsmith Paua, Manley Chinook, Bob's Devices SUT, SugarCube 1 mini
* Oppo 203 & 103D, EverSolo DMP-A6
* miniDSP Flex, Audiosensibility & Blue Jeans cables, Symposium & Isoacoustics, GIK
* For RDJ: Anthem MRX720, Sierra LX, Luna Duo v2 center, CXNv2, TBD