I picked up a pair of 580's a few months ago, figured what the heck, cheap and returnable. I have had dozens of speakers over many years starting with Dynaco A-25 around 1970. There is thousands of posts on these at avs forum
https://www.avsforum.com/threads/jbl-studio-series-5-the-magic-guaranteed.1422898/They are legit, I am totally happy with them, just a fun speaker that makes me smile, in particular the soundstage is wide open and deep, I do not hear brightness/
Qobuz >> Bluesound node 2i coax out >>> topping D70 s dac>>> Gustard H16 headphone amp - preamp>>Buckeye amp Hypex NC252MP Amplifier, 2-channel >>> JBL580 / Svs SB2000 pro