Back in the 90's when I was doing my masters in Audio and Acoustic engineering at Solent University we spent many months doing blind trials with different types of interconnect leads. After thousands of comparisons with very little compelling data we accidentally stumbled upon a change that a massive 63% of our guinea pigs said increased the quality of the lower range frequencies. We had changed the colour of the speaker cabinets!
Believe it or not, maroon gave the most consistent results.
Believe it or not, maroon gave the most consistent results.