Who listens to ocd anyway? He bad mouths every brand, every dealer, but he comes to the rescue with his gear.
The room is the #1 area that needs to be fixed before doing anything. A bad room will make a great speaker sound like sh$t. But a good room can make a bad speaker sound a little better, but can’t perform magic.
As for changing the way speakers sound, there are many ways to do this for either free or for small amount of money. Speaker positioning can alter the sound in a big way. Change the inside wiring or alter the crossover to make sq changes.
System synergy is another area to look at.