I think you can design a quality array using Dayton Neo 20FA tweeters. I did, and I used 60 of them total. That's a huge number of tweeters to spread the sound through. I you use 8 planars on a side, that is a far cry from 30 domes, per side.

Additionally, if you use a midrange that retailed for 12-20 bucks each, again you will get high quality sound since EACH they don't have to play loudly. My Sammi's were a great buyout at $3.50 from a regularly priced model of 12-18 bucks(you don't get a 10 oz magnet and an X-max of 3.6 mm for 49 cents!). Other companies besides PE that also participated in the buyouts are now selling them for 7-10 bucks each. Fine little speakers. Going below those levels may get you an OK system, but below the level that I would consider appropriate for all the work involved. Buying a 49 cent NSB midrange is not appropriate for all the work involved in my opinion.

Always compare the quality to what you already have. I did.

Marlboro