Pairing Planar Speakers With A Subwoofer (Eminent Technology)

What happened to the DD-18 on your list? 

If you still have it I'd slave it from a 10" or 12" DD Plus for a sort of modular 1812. I had one brief experience a few years ago setting up a pair of DD-10 Plus with a receiver equipped with Audyssey (I don't recall which level or the setup details). In that room the Velodyne Manual Room Optimization procedure did a noticeably better job of the basic integration than Audyssey not to mention the two custom movie presets.

I'm sure there have been Audyssey upgrades since then. I found it to be so useful with the rest of the system in this particular room I wouldn't dare dismiss its capabilities.    

  

I tried my two 12" Plus using separate left and right signals and located near the speakers which seemed OK but left many room nodes. Summing the signal at the same speaker location increased solidity or possibly just loaded the room better but the nodes were still present.

Finally positioning the subs in two irregular locations using a summed signal really locked the room and eliminated all but a few extreme corner nodes.Then again every room is different when it comes to the low end.

The Plus can be simultaneously connected to both a stereo and HT systems. 

 Good luck with it.