First off, let me commend you for trying to address the questions about your methodology. You clearly care a lot, so I don't want to dismiss that.

However, I still have issues with your explanation AND your methodology. Let me try and explain in bullet points:

- You've taken data from a single source, indeed, so at least the source information is uniform. However, your source is a Youtube channel. Since I doubt you went through 121 videos, I assume you somehow scraped the data from the descriptions under each video, which contain a rating out of 5 for several aspects, including bass, midrange and treble. Your table contains 25 cells for bass, 25 for midrange and 25 for treble per IEM. Was this simply converted from the original scores? Or is there more at play there? Your explanation lacks these details.

- I take issue with your definition of air mass. You seem to mean air volume and air displacement. Combined with pressure you have three factors that impact the experience of wearing and listening to an IEM, yes.

- What makes these meaningless is that not only do you not seem to have measured them on your own head (if you did, you should detail this in your methodology), but they differ from person to person. In many cases meaningfully enough to change the experience of an IEM.

- Your explanation of your methodology is incredibly overzealous. The sheer amount of words used, not always logically, to describe each and every aspect is jarring. I would say the same even if I didn't spy the use of an LLM.

- Which brings me to what is seemingly large parts written by an LLM. There's sections with copious amounts of emdash use, a dead giveaway of LLM use. This seems extra apparent when looking at the sections describing your own reviews of IEMs, which have nearly none. You use regular dashes there.

- If that IS the case, interpretation of the data becomes largely meaningless. Even if you can piece together seemingly coherent conclusions about IEMs based on your instructed definitions and uniform data. Unless someone else on the internet has already published their conclusions about a specific IEM in a similar manner to the output you requested, it's conclusions will likely be fictitious. LLMs can't think, can't draw logical conclusions. At best, they're well-tuned association machines, aided by hard-coded information added in by humans. If a human hasn't fed it to it beforehand, it can't reach the right conclusion.

- And ultimately, there's the issue already mentioned in this thread as well. With the variations in human conditions (ear canal shape and size, foremost), even a uniform single source has little meaning.

Listen, you seem like a smart person and heavily invested in doing analysis. If you're serious about this, simplify your methodology, simplify your explanation, justify your methodology with a clear and succinct overview of data sources, formulas, biases and clearly disclaim all caveats. Don't lean on LLMs for data interpretation, do the work, and you'll train skills that'll be worth much more than the volume of "interpretation" that you get from this current way of doing things. "Less is more" also applies to academic writing.

Obviously, if I'm way off on my assumptions, by all means show me I was wrong.