Tidal vs ATC

roxy54 is likely referring to the ATC SCM 19A at 7K which is the smaller brother to my ATC SCM 40A.  As I've stated here several times, I'm mystified that more do not seriously consider active speakers.  

The cost argument is rendered moot when amplification and speaker cables are eliminated.

The immediacy, dynamics, timbre and slam are shockingly good.  Hope your results are satisfying.

That is a very big room to deal with.....Keep in mind that the Tidals will be a clear lens for everything that comes before them. Imo, that means that your amps and source will need to be of very high quality. An amp that will be required to fill that room will be costly....If you want to spend the dough on the required source and amplification ( and cables ) to match the resolution of the Tidals then you will have a stunning system. 
On the other hand, a pair of big, active ATC's with a great source may be more cost effective...In either case, a forum like this one will be of little help at this level of investment- you need a good dealer and in home demo imho. Good luck!  

Ok thanks guys. Ill just try to find a place to demo ATC.
As for Tidal I was thinking of pairing them with tidal electronics or Pass XS line.

Never heard the ATC, but if I were in that market, Tidal is where I'd look first. I heard them at the CA Audio Show last summer; I think the model was Contriva G2, powered with Bricasti. It was the best sound of the show by far for me.

A big thumbs up on the Contriva G2, 3 1/2 years of ownership and still frequently miraculous!