depends on your music taste, but i won't like the burmester-tidal combo, and if regarding tube power amp, i blew up mine, 150 watt tube when trying to drive sunray.
now i drive it with friend's ss monoblocks, the sound is more open, not restrained like before.
about contriva vs sunray, well, like geopolitis said, sunray is a more demanding speaker, so you will spend more to bring out its potential, but i can tell you that it is well spent.
regards