I think of it this way. First you need the dimensions of your room. Then you decide where to place the speakers - usually at the short end, playing along the length of the room. Then you investigate and test speakers and amps to get the best match room - speakers - amp. If you have persistent problems - maybe not, if you have a large room, you treat it a bit (not too much).
Newbie want to improve what I have
I am brand new here already purchased my first system. Probably made some mistakes. So I bought an NAD M33, Focal Sopra No 1 speakers, Tellurium Black II cables with an Isotek EVO3 Polaris. I am enjoying the system but realize I've probably made some mistakes. So as a humble novice I'd love some advice where to start to improve my system. I thought perhaps starting with the cables. Looking too warm this up.