Mconfig is a quite simple job.
I've been reading on the forum that EBA makes a big difference. By my experience it normally doesn't do a lot but at one time it did mather a lot. The soundstage seemed wider when the EBA was off on the 818 and it seemed that the master DSP was playing a bit louder, the bass a bit heavier and less imaging in the middle of the speakers (due to cancelation of some crosstalk?).
When changing the EBA setting on the 818 to on things cleared up a lot, bass got tighter, imaging between the speakers got better,both speakers the same loudness. But the soundstage seemed a bit less wide.
After some searching in the settings the master DSP had EBA on the SpeakerLink setting (SL) and the slave had EBA set to (always) on. The off setting gave a difference in delay between the speakers. So putting EBA setting to on the 818 put both DSP's in EBA ... and gave them the same delay and sounded a lot better

With EBA on SL setting on both DSP's the difference to my ears is small between on and off, but when I use it with my surround setup the delay with EBA on is noticeable so there is certainly something happening with EBA on
