I have two but I never bothered to put them into stereo mode. I just use them around the house to have music where no stereo exists, like in the workout room. But for science, I just got both together. It is stereo, but the middle is just ...kind of not there. There is just a hole in the middle. It's really not good.
I like these speakers standalone, with the EQ you can really tweak them for a given placement, but the stereo mode is laughable.
e: I just noticed that the left channel is much louder than the right channel. This is just a broken mess. I turned them on individually, maxed the volume on each then paired them again, then got no output. And now it works again but the left side is still louder.