I'm getting too old for this, I have no idea what "5.0 AptX HD bluetooth TX and RX ( LG V30 and an appropriate RX)." means, absolutely no idea at all - and I don't think I've missed much by not knowing!
Mom, I too feel like I am cut off from present technology. However the fanfare of the acronyms which opens this post only suggests a way to get quality music listening via a bluetooth device. All you need is:
1) a bluetooth transmitter/receiver which allows you to turn any audio system with aux/line-in into a wireless system that can be used with a smartphone/tablet;
2) a musical source, case in point a site from where to stream the music of your choice via smartphone/tablet.
Many members already do this, and the market offers alternatives. For instance, Jorge's streaming source is Tidal ("the first music service with High Fidelity sound quality" says the site -- very interesting), which he accesses via Chromecast audio rather than via AptX HD.
Thanks to Thanh Hoang Cong for sharing his favorite set up, I suggest he tells us more about him in the Introductions section of this site.