Wrapping power cords and interconnects with copper foil.

Aliexpress

Acoustics include psycho-acoustics and is not what is usually discussed in audio thread : room panels...And audio journey include also musical knowledge ...

Myself i lamented about how people experiment so little with the ground root of their hobby , not engineering, sorry but acoustics. not branded name of tubes or digital gear but the link between gear-speakers/room/brain-ears...

Most Engineers in all fields as the average men buy a piece of gear and called this audio if they had bought the best reviewed product; they are only divided between the value of measures versus  how they feel after listening ... This is what people called audio journey .... Not me and some others more enlightened one ...

Acoustics experiments is the core not only of audio experience but of the musical and sound understanding.

Unfortunately this is not a group about engineering or physics most people here seem to be interested in the hobby more than the engineering principles. Sad people who love listening to music so much have such low regard for the foundation of their hobby.

If i was sensitive to laughing and mockery i would never had created my own system/room by experiments  which put me now  in ecstasy at peanuts costs...

I would had given 50,000 dollars( i dont have) for that and called it audio done...

And human nature being human nature i could be here mocking my own ghost because he insist too much on the fundamental and only way to improve any system at any price : mechanical,electrical and especially acoustical devices controls of the room/system...Not upgrade first and last but optimal means of controls.

Not sleepwalking consumers buying power but basic knowledge in acoustics and other basic tools.

I stop giving my experiments results here long ago except in general way of speaking because instead of welcoming each one experience with an inquisitive and curious mind many people gave sarcasms or common place engineering explanation ....

The same people often gave their money in gear upgrade not knowing how to improve their audio at no cost...

Yes i used copper foil and numerous others basic facts and basic no cost devices...

And after their upgrade they are convinced by (consumers bias) suggestion in the same non controlled room that all is better... Then they read about someone making a low cost experiment and they throw sarcasms about their tin foil biases about S.Q. value...

Most audio thread are useless because instead of experiments they spoke about gear...

It is once your gear is bought that begun the audio journey not before or not till an upgrade... It is after you had bought the gear that you must learn how to put them at his optimal unknown working level with mechanical,electrical and acoustical embeddings controls method and devices... Including copper foil....

Congratulation to the OP for his courageous thread at best  facing ignorance, because no ears/system/room react the same way to any  change or at worst contempt by programmed mind with no need for any experiment ...