After having used these side by side with the jbl lsr305 for almost 2 years now I can say these are pretty mush as good as jbl-s I would give these the upper hand on the low end since these have 8" woofers vs 5" on the JBL but the JBL have more clear high and mids I would say. I regularly swap these between my PC and TV both sets are fantastic. These are big tho, so if ur low on space, get the 524 or 624 instead!
Used to use them with lexicon alpha audio interface and have the focusrite scarlet now, cant fault them. Would love these to have BT but studio monitors usually dont, that`s my only gripe.