Sony - XV500

Soundcore x600 or Sony xv500 Bogasing G4 I have all three , all of them have low latency over Bluetooth.

Depends on what you are looking for. The Ult is much bigger, can get much louder and has much stronger and deeper bass. Yet it changes its sound balance more depending on volume, so i felt the need to adjust the eq more often. Also the sound signature is different: while the xb43 is warm and mellow, the Ult 7 sounds more crisp and punchy, at higher volumes even harsh. If you like it mellow and natural sounding the xv500 is better, it is also very consistent over vall volumes. If you are looking for sth for intensive music listening, the best idea, and also the cheapest, is to get 2nd xb43 for stereo pairing. If you want sth mellow like the xb43, but bigger, louder and deeper bass, xv500. if you want sth stronger with real hard hitting punch, impressive bass and crisp sound, ult 7.

I replaced with an xv500, which has the more natural and consistent sound.

Sony xv500 or JBL 120 would be great for such occasions. I use a sony xv500 for outdoor salsa/bachata meetings. If there more than 20 people, i add an sony xb43 and xb33 to complete the Sound. But 1 xv500 is enough for up to 20-30 people. I think the jbl 120 has even a more power, but is also a bit larger. Not sure also if/how pairing with smaller jbls works. If you have to respect other people nearby and dont want to disturb nearby people too much, you might sth smaller. Sony xg300 would be in your budget. Uboom x or stormbox blast give more power for bucks, but dont have the flexibilty to expand the system like with jbl and sony .

If yo want just 1 speaker, for 300 i would get a sony xv500. If stereo is important, get a 2 speaker system (or 2.1). You could get 2 minirigs, if you dont mind cabled connection. You could later add a minirig subwoofer. I dont know about that edifier.

Sony xv500. 2 if you want real stereo. This has a very nice warm& natural sound.

Sony Ult 7 is much bigger than bose max. That means its also louder, more and deeper bass, plus it has extras like mic in, lights. The only reason to choose the bose is the much smaller size. It good at producing a lot sound out of a very compact package, but apart from size, everything speaks for the Sony here. If size/weight dont really matter, for the pricevof the ult7 i would rather go for the sony xv500 or jbl120. The sound of those is much more balanced, rich and consistent over different volumes. But these weigh around 11kg (sony ult 6, bose max 3).