I'd bet the center speaker is the 570 with 5-1/4" drivers, not the 580 with 6-1/2" drivers!
https://www.jbl.com/STUDIO+570BK.html
Generally, the 570 seems to have fallen into obscurity, and I can't think of much reason for it other than, perhaps, as a concession to WAF!
@slipperybidness ,
to my eye, the 570 comes off as being a little too petite and cute to be taken serious (although I bet it sounds fine with the right sub complement - the compression horn tweeter will certainly not be meek!).
The 580 is about what you (or at least I) would expect out of a solid tower, and the 590 has that extra size to suggest thoroughly competent muscle to do anything you ask.
I honestly don't think the performance, if well matched to a sub would vary too much between these 3 speakers, but the visual assessment of them is pretty substantial and I suspect I (if not you) would be inclined to hear more difference than really exists in a sighted comparison. Like I say, the compression horn tweeter is going to give even the littlest model a lot of "get up and go"!