Two questions to make you mad.

Audiophiles, subjectivists as objectivists  suffer from only one disease : psycho-acoustic basics knowledge ignorance and then gear and/or tools  fetichism... The gear fetichism of the subjectivists  cannot be explained if we do not point to their acoustic and psycho-acoustic ignorance... This ignorance is a well shared ignorance in general anyway among objectivist  as well as among  subjectivist audiophiles...

This why there exist so much threads as this one attacking one group or the other...Ignorance...

Reading this is like following a wild pig trail, except it’s in a video game and the scenes occasionally repeat. 
 

Those are direct instruments , in guitars or amps I have used better capacitors, wiring and tubes and better cabling connectors to enhance the fidelity of the Amps , guitar and this to for sure applies to loudspeakers the Xover is a very important component , these speakers extra voice fine as a direct monitor 

but not even close to a full range Loudspeaker ,it has its place in a specific area .

The main lie by omission in audio is that we ( the industry and consumers) for OUR convenience forgot to say even to ourselves that the acoustic and psycho-acoustic knowledge value exceed the gear pricing....

Then going after cables or pointing to the difference between live event versus recording one , is missing the main point ...And this mislead people putting them in two groups : subjectivist and objectivist, the two groups focussing on the gear / measuring tools components instead of the psycho-acoustic event which need to be controlled ...

Anyway all these old quarrels  in audio will soon disapear in a psycho-acoustic revolution  which is already here...