That Sony TV has (relatively) unobjectionable speakers -- that's why it's so thick at the base.  And the BL2500s were at the bottom of the old B&O range.  So you *may* get better sound from them, but I would definitely compare, once set up.  Connection is easy though: Use the 3.5mm "Audio Out" jack at the top right rear (has a picture of headphones above it) for variable volume audio out, and get a cable from this website's sponsor (lower left corner below): 3.5mm stereo male --> 2x Powerlink DIN male.  You may need buy a splitter instead or ask him for custom wiring, because the 2500's don't have Powerlink DIN daisy-chaining built in.

For some fun, get a splitter on the 3.5mm end to connect to a cheap powered subwoofer and hide it somewhere, which will give the surprising impression that those 2500s are punching well above their weight!

As to Bluetooth, it was supposed to output to Sony wireless sound-bars etc. but I'm not sure about input from audio players.  But It's an Android TV so you can ChromeCast to it -- supposedly, I think that was supported back-when -- and therefore play the result over the hardwired 2500 speakers.