I'm not sure it's a really great experiment though?

Outside of the hyper-crazies, no one is really stating that a 6-12 inches of conductor is going to make a giant difference in audio quality. Yes, I'm aware of the super-premium-gold-plated-platinum-encrusted 12" audio patch cords available. But almost no one really makes serious arguments those do anything.

I don't think running a 50ft banana is going to have similar performance to a 50ft properly-sized copper conductor though.

Where you get into the "debate" is the difference between buying a spool of 12ga stranded copper wiring from Home Depot, or buying the same thing only with de-oxygenated or whatever silliness some audiophile brand is selling for 10x the cost.

There are levels to things. I imagine copper speaker wire to be essentially fungible. Just size it to your length of run and max power needs. Calculate the total resistance for your wire run and done/done. All professional level sound installations for venues and what-have-you do this already.

This sort of test just seems to prove nothing in either direction other than provide bait for folks to point and laugh (or defend) in comment sections. Consider me baited, I suppose!

It depends on the experiment done… You need every intermediate point between the wires to be low distortion too. As in, audiophiles cannot distinguish between distortion and distortion+distortion is not really an interesting result.

You need source, digital to analog conversion, pre-amp, amp, speakers to have low distortion too, and you need the room to be appropriately treated too. I didn’t look at whether they did all that but I seriously doubt they did.

I have always said and will always say the same thing:

Up to a point, there's an easily distinguishable sound and detail difference between cheaper and more expensive gear, given that you don't cheat (i.e. put cheaper gear in expensive enclosure), but that difference indistinguishable well before these "true audiophile" level stuff.

For example: I run a pair of Heco Celan GT302s. They are not something exotic. 100W per channel, adequately detailed speakers with great soundstage. The manual gives you a table: Wattage -> Recommended wire gauge. I got a high quality, 100% copper cable (from Acoustic Research, so nothing fancy) at the recommended gauge, and connected them. You can't convince me to get a better cable. It's pointless.

Do I enjoy the sound I get, hell yeah. Do I need to listen to my system instead of listening to the music, hell no. I feed the amplifier with a good turntable (which is 40 years old, shocker!) and a good CD player (which is pretty entry level for what's out there), and that's it.

That set will nail any person who likes to listen to the music to its chair. That's the aim of a good system. Same for personal DAPs and DACs. If you enjoy what you have, who cares!

My hypothesis is that the $1000 cables help sell the $300 cables. I’ve seen comments to the effect of: “I’m not fooled by those $1000 cables, so I saved my money and got the $300 cables instead.”

In other words, they got fooled.

What’s happened in electronics is that there’s a cutoff, above which the audio quality doesn’t get any better, but that cutoff is much lower than anybody can believe. So the psychological cutoff is higher than the physical one, and a role of marketing is to raise that cutoff even further.

it also puts a market value on said placebo effect...

This may be an unpopular opinion, but if people believe they can hear a difference in their $1000 cables, and they enjoy purchasing and testing them, I'm inclined to let them enjoy themselves. I have a basic hi-fi setup with rational cables, and enjoy the cost savings, but to each their own.

I feel the same way about wine. At a certain point, it's not really about objective improvements, it's about vibes and lore.