Let's do this. I picked the cheapest Windows 11 laptop i could find over here,
and then i paired 1 JBL Charge 5 via Bluetooth to it.
Once the music starts, i activated the JBL PartyBoost on both speakers,
and voilà there they play in STEREO !!!

Why stereo? Yes, you need to pair one to your smartphone, and use the JBL app to activate stereo. Once they are in stereo, that mode stays in there until you change it, or until you reset the speakers.

Pretty easy stuff, and phenomenal sound!