Unfortunately, there is virtually no product reviews, so I had no idea what it looks like with the sound (the main criterion). However, since there is the right of withdrawal, I have the Speaker ordered.
And I must say that I am not disappointed (do not forget 150 per pair). I have connected the R1700BT a Fiio E10K Olympus 2 on PC. The sound is perfectly fine: Details can be out to hear well, the bass is pretty strong, volume is more than adequate (have not yet dared to crank) and the music dissolves well from the speakers, one gets the feeling, singing and drums came from behind the window viewing. Unfortunately, the sound lacks a bit of clarity (the speakers have only a few days, maybe need a little break-in period).
I will keep the speakers and can recommend it as well.