I almost bought a Sony XG500 during Prime Day on Amazon as it was 50% off (from $500 to $250), but I came across brands like Devialet, Morel, etc. so I reconsidered. ...Any other interesting brands that's considered Hi-Fi?
For hi-fi most would consider a stereo set up with some separation of left and right channels to your choice, a frequency range of 20 - 20kHz but many decent hi-fi speakers don't go below 40Hz and fewer below 30Hz.
Devialet Phantoms do hit 17 Hz and 108db but are rock concert loud or soft back ground and full stage hi-fi as a pair. Even Devialet Phantom II are ten times your $250 spend and are not battery powered.
Devialet Mania is battery powered but they pair in multi-room not stereo.
What is not hi-fi is any system with only Bluetooth. Bluetooth is lossy, compressed and poor latency (lip synch issues with video). Low latency Bluetooth and lossless needs source and speakers to have them and is still compressed. Apple Airplay 2 is compressed but lossless and limited to stereo. you need wi-fi, DLNA, uPnP chrome casting for better stereo. This also will not scale to surround. The solution for wireless surround is WiSA or get locked into to something the manufacturer has designed.
Phantoms offer fibre optic, Ethernet and wi-fi inputs so you can cast lossless from computers, mobile phones and connect over fibre optics from a TV.
B&O offer a large choice of life style speakers and the Beolab range passed and present for stereo to full surround sound. Whilst the prices go ever up and they seem to want to prove the false claim that they are too expensive - style costs and so does the material used to machine the speakers cabinets. Only you can judge if they don't sound what you think you can get for the money. Don't compare the price to passive speakers, consider that now they have built in streaming, DAC, pre and power amps, room correction and a nicely designed app. Beosound speakers go a long way to getting a higher than expected sound quality from a tiny box, well ignoring the A9 with is just big - from Emerge, Level, A5, Balance, Belab 8 and 28 are solutions in a single or pair of boxes.
Cabasse Pearl Akoya Wireless Speaker and their other £22k speakers have a different look and well reviewed.
For more portable like the Sony XG500 yet hi-fi solutions you are looking at B&W Zeppelin, Meridian Ellipse and Sonus Faber Omnia. With no separation of left and right many would not consider then hi-fi. For battery powered you might look at pairs of B&O Beosound A5 or Level speakers for full stage stereo. Not hi-fi? Go and listen for yourself and decide. Whilst not the end game in audiophile I am hard pushed to say I am missing anything in streaming or stereo compared to the flexibility of a pair of Beosound Levels (£3.2k) and have £14k speakers to directly compare. Your ears, your budget, your choice.