Hi Tbg, although I have lately pleaded for generous amplification with the Tidals myself (it would indeed be a crying shame to leave these speakers famished), I would see the matter less dramatic as to define minimum requirements of 200w per channel for the Contriva. I perfectly understand it leaves one with a feeling of "must have" when Tidal's own web page states: "To use the whole enormous dynamic range of it and listening complex music also from time to time very loud we recommend 200 watts at 8 ohm." Yet, I have been living with the previous model Contriva driven by a Tidal Intra - which delivers something like 2x 120 watts - in a fairly large room. Sure, I have felt the desire to own a pair of Impact monos (and still do ;^)), but, in honesty, not because the speakers were in obvious need of more juice. Of course, stable and fast the appropriate amp should be, allowing the horse called "Music" to jump, run and kick freely as far and high and fast as it can but, by all means, never suffocate it with its bridle. I believe.
In addition to Geopolitis's list, an alternative product that may fill the bill where high power output is demanded is Karan, starting with KA-PAS 450 delivering 2x 360 watts into 8 Ώ and performing naturally and musically refined; no guarantee though, just gut feeling based on limited time spent listening to it in another system.
On my personal auditioning wish-list, I would like to hear what a couple of Einstein OTLs (The Final Cut MK 60) would be able to do paired with Contrivas, although that translates in 2x 60 watts only,... just being curious...