Im a firm believer in burn-in... psychological burn-in. Why fight so hard to maintain an imaginary reference sound that is unverified accurate but just what you're used to. I dont think any of my headphones are perfect and all of them are various forms of compromises anyway. I like each of my headphones for their differences. Many from my age group started with iPod earbuds, that was our reference. We then experience and learn and our perception keeps changing and evolving. Yesterday's Hi-FI is today's MID-FI. Yesterday's holy grail is today's major...

Already well documented that these are pretty good and nice bang for buck. I got these used recently. Bought to use as parts, but Inhave to say I like them better than recent Hifiman 5XX and 400se. A little less grainy, more linear frequency response. Still a little sizze up top around 8kHz like Hifiman 4XX, wish they had a little more bass like 4XX. Con: Too cheap. The price for higher strength magnets is probably just a few dollars. Hifiman charges hundreds or thousands of dollars difference between models. Fang’s phd was in marketing or nano...