The "most foolish" loudspeaker tweak/upgrade ... is

I think the problem is that peoples' mental self influence is often stronger than their audio memory or discrimination.  I feel it myself most times I try out a new piece of audio gear that I've just purchased with the intent to upgrade. 

Actually, the poster above's comparison to fashion might be the best I've heard.  Fashion is totally subjective and in no way quantitative.  Of course fashion is fi kle and influenced by celebrities, price, ....   There is no objective measurement nor any pretense of one...  The audiophile world is very different on that account.

Because of Doug I've rewired my entire home.  And the lines into my home.  I'm trying to get comed to change theirs too.  Until then I can't listen to my system.   

I use a cat trampoline to suspend my cables inside the speakers

I use my grandpa's suspenders to suspend my disbelief.