I used to believe speakers were responsible for at least 80-90% of sound quality. In my mind, pricier amps, cd players, cables, etc were just for showing off your money or provided a marginal improvement at best.
But recently, I tried an external DAC (quite cheap, actually) for my Mac Music Server. The improvement was night and day. It took my Sierras to a whole new level. Now, I'm rethinking the whole equation. While speakers are extremely important, other components certainly DO MATTER.
Also, many intelligent people who clearly know A LOT MORE than me about audio own monoblock amps, four figure DACs, etc.
All this leads me to believe maybe some changes in my system could provide AUDIBLE IMPROVEMENTS, such as a better 3d sounstage.
I've also considered room treatments, but they seem to require a lot of knowledge to implement well, and my wife won't be happy about them either.