My take is a bit different. First, I think the most important thing si to get the best possible source - and an ic which allows it to transmit its sonic might to the amplifier. Second, is the right loudspeaker, whose sonic signature and size fits best to your music taste and the room you plan to put into. Than come the amplifier, which is able to drive that speaker and a right speaker cable. Finally you tune the system with right ac treatment gears, power cables, isolation devices, and acoustic treatments. If you reach a kind of synergy whic you like, when all is at place - comes the issue whether any change would really represent a diminishing return. But than, when you put everything in place, you thought you have found the sonic nirvana at home - comes an outstanding gear which you just take home for audition - and that shows the weaknesses of your system . and you begin again the system upgrade process until you dont reach the new synergy - at a higher level. And than ...