No offense meant, but I cannot be be sure making such a statement. How can we be for sure? Has there been a verifiable validateable scientific experiment on this? I personally switch between my headphones to make sure that I’m jot getting used to their sound signature which helps avoiding bias. What U can tell from experience is that mew headphones sound like crap regardless of brand if driver type. From materials science point tod view though it may make sense to me that the drivers calibrate over time and adjust 🤷🏻‍♂️ We seem to need some funds to run unbiased scientific experiments 😉