Hi Thomas the whole thing matter but other thing need to be in order like speaker placement room treatment carpet, etc. if you have quality component and the above you will see a different. If you have one speaker in a corner and the other out in the wide open with tv above and big dirty window behind you head, save the money or spend on weights or something g to get your body big and strong and turn woman head like me.
Basic 12g copper speaker cables to $$$ cables.
How much do you have to spend to hear a difference? In other words, is an $80 upgrade worth bothering with? $200? $800? Etc. Let's say we're talking about an 8K system, with speakers as the best component.