Some good info here. The Sony kit was pretty basic. 4 tiny speakers for the corners, a centre speaker, and the sub. Tried to take the sub apart, but the frame is all glued chipboard. None of the bits I could get to seemed to be the problem.
Have bought the 2nd cheapest (budget is “not much”) Yamaha from richer sounds, as it has good reviews and they said I can take it back if it’s either not the sub, or I don’t like it .
Interesting about the floor standers. I’ve actually got my old hifi speakers in the loft (banished for being too big! Not floor standers, but I do have stands. Wonder if they’d be better.
Tbh though, I’m not really trying to improve anything. As it was it was ‘ok’. Loads better than just the TV speakers. If I wanted to improve anything, it would probably be the centre for dialogue, but the current one is low enough that it sits on the table in front of the TV without obscuring the view. Anything bigger and I need to raise the TV..