Whew, I agree with the others regarding reeling in expectations. Achieving "concert hall" sound is a rather lofty, upper echelon goal. Many (most?) speakers, even expensive ones, fall rather short of recreating a concert hall type listening experience. To do that requires the usual qualifications (linear on axis, smooth off axis, low distortion, absence of resonances, etc.), plus more (high sensitivity, unrestricted dynamic range...). Such speakers are not inexpensive. $500 just isn't going to cut it. The budget is orders of magnitude too low.
So if a convincing facsimile of a concert experience is really important, save up until you can afford something like an Arendal, RBH, upper end JBL Synthesis, Danley Sound Labs, or Sigberg based system.
My own (decades long) quest for "concert hall" sound, limited by a mere mortal's budget, meandered through used Klipsch Heritage (which sacrifice some of the basic qualifications mentioned above, but at the time were cheap entry to concert-esque sound) to DIY kit speakers (Fusion12 Tempests, which surpass any Klipsch Heritage I've ever owned, and I owned most of 'em), and even the kits were over $1k just for the parts.
For $500, the closest you'll get is probably snooping out the most bangin' active studio monitors (e.g. JBL lsr308) and a cheapo streamer.