Well I've just bought a large TV now due to limited space I'm undecided if I want a Bluetooth sound bar behind where I'll be sitting or if I'm doing that is it crazy to simply run a large Bluetooth speaker.
I have about 950mm window ledge I can put a speaker.
I don't really have the space to run a sound bar in the conventional space under a TV.
You don't want a bluetooth speaker connected to TV due to latency (it's why most game consoles don't support it). Unless you just meant "wireless" speaker.
Bluetooth speakers are fine for music audio as there's no need to sync to what's on-screen.