Reactor 600 vs 900

[ogs]

600 and 900 are identical apart from the difference in amplifier power. The 600 is actually a 900 with electronically reduced max power AFAIK. I do not own either, but I've read that the 900 has a bit more bass power when playing loud. At 'normal' sound levels (whatever that may be...) the two should sound quite identical.
Two 600 (stereo) will be better than one 900 in my view, but of course more expensive than a single 900.
I would not be surprised if Devialet at some point in the future increased the power of the Reactors via a firmware upgrade. They did this with the Phantom speakers and has done the same with Expert amplifiers several times.