The audio industry loves a good myth. If you spend enough time on high-end forums, you will eventually be told that you need to spend thousands of dollars on cables to hear the “air” around the violins. But in late 2024, a user named Pano on the diyAudio forum dropped a project that tore that entire philosophy apart. It wasn’t a fancy studio album. It was a blind test involving a laptop, some copper wire, a bag of dirt, and a piece of fruit.
This project, known as the “Copper vs. Banana vs. Mud” test, is the most punk rock thing to happen to audio in a decade. It forces us to admit that physics doesn’t care about your wallet. The results are in, and they are embarrassing for anyone who just bought $5,000 interconnects.
The Setup
Most audiophile reviews are full of flowery language about “soundstages” and “micro-dynamics.” Pano skipped all that. He set up a rigorous Double-Blind ABX test. This means the listeners didn’t know what they were hearing until after they voted.
The signal chain was aggressively basic. Pano used a Dell laptop and an M-Audio interface. He recorded music passing through four different paths:
- The original digital file (the control).
- 180cm of professional copper wire.
- 20cm of wet volcanic mud.
- 13cm of a banana.
He connected the mud and the banana using old microphone cables soldered to U.S. pennies. To keep things fair, he wrapped the mud and banana in aluminum foil to shield them from noise.1
The Sound of Dirt
You would expect the mud track to sound terrible. It should be muffled, distorted, and unlistenable. That was the expectation. But that is not what happened.
The listeners on the forum downloaded the files and tried to identify which was which. The results were a disaster for the “Golden Ears” crowd. Out of 43 total guesses, only 6 were correct. That is a success rate of 13.95%.
To put that in perspective, if you just guessed randomly, you would be right 25% of the time. The listeners actually did worse than a coin flip. The statistics showed a 6.12% probability that the results were pure chance. In plain English, nobody could reliably tell the difference between a high-end signal path and a pile of wet dirt.
One listener even preferred the banana. They said the track played through the fruit sounded “more open” than the original digital file. This proves a massive point about audio: we often prefer distortion if it sounds pleasant, even if it is technically “worse.”2
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Why It Works
This isn’t magic. It is basic physics. The copper wire uses electronic conduction, where electrons move through metal. The banana and the mud use ionic conduction.
Bananas are full of potassium. When you send an audio signal through a banana, the ions ($K^+$) carry the charge. Pano measured the banana’s resistance at 5.1 kΩ. While that sounds high for a wire, it is actually negligible for a line-level audio signal.
This is due to the Voltage Divider effect. Your amplifier or audio interface has a very high input impedance (usually 10,000 Ω or more). Because the input impedance is so much higher than the resistance of the banana, almost all the signal voltage gets through. The banana acts like a volume knob that is turned down just a tiny bit. Pano fixed this by normalizing the volume of all the tracks, so they were exactly the same loudness. Once the volume was matched, the “muddy” sound disappeared.
The Liner Notes
This isn’t the first time someone has exposed the cable industry. We have to look at the history here.
In 2008, a group of audiophiles performed the famous “Coat Hanger vs. Monster Cable” test. They compared expensive premium cables against four wire coat hangers twisted together. The result? Listeners could not tell the difference. They actually described the coat hangers as sounding “excellent.”3
Then there was the Richard Clark Amplifier Challenge. He offered $10,000 to anyone who could identify the difference between two amplifiers, provided they were not clipping and were level-matched. Thousands took the test. No one ever won the money.
There was also the $1 Million Challenge by James Randi. He offered a million dollars to anyone who could prove premium cables sounded better than standard ones. The high-end cable company Pear Cable famously backed out of the challenge.4
The Verdict
The “Copper vs. Banana vs. Mud” sessions are a wake-up call. We are moving into an era where measurements matter more than marketing. Sites like Audio Science Review are getting more traffic than traditional magazines because people are tired of being sold snake oil.56
This experiment proves that as long as your cables aren’t broken, they are probably fine. The “air” and “warmth” people hear usually come from their speakers, their room acoustics, or their own brains.
So go ahead and buy the cheap cables. Or, if you want to be really alternative, just use some dirt from your backyard. It apparently sounds just as good.
- https://www.tomshardware.com/speakers/in-a-blind-test-audiophiles-couldnt-tell-the-difference-between-audio-signals-sent-through-copper-wire-a-banana-or-wet-mud-the-mud-should-sound-perfectly-awful-but-it-doesnt-notes-the-experiment-creator ↩︎
- https://www.diyaudio.com/community/threads/copper-wire-vs-bananas-vs-mud-an-interconnect-test.420367/page-2 ↩︎
- https://thewelltemperedcomputer.com/Fun/CoatHanger.htm ↩︎
- https://www.audioholics.com/news/pear-cables-worst-tech ↩︎
- https://archimago.blogspot.com/2026/01/audiophile-potpourri-december-2025-web.html ↩︎
- https://archimago.blogspot.com/2026/01/audiophile-potpourri-december-2025-web.html ↩︎
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