The GQs are a different beast for sure. Being closed-back is also a factor. But it all depends on what you are used to. Many people are not used to hearing music with little to no distortion, or w/o an over-hyped response.
My particular set doesn't have any overemphasis or harshness in the treble like some reviewers have stated. I would actually prefer if they had just
a tiny bit more high-end response in the upper "air" frequencies. Cymbals, snare drums/rim shots, and saxophones don't
quite have the "bite" that I experience when playing them in real life.
Interesting. Thanks for your impressions. As others have stated, there are A LOT of variables that can affect this outcome even before the music gets to the DAC/amp stage. I agree regarding the use of a bit-perfect playback mode whenever possible, especially for any type of A/B comparison.
I somewhat agree with you, as some of the "manufacturer-recommend" burn-in times are LONGER than their return period for the product, LOL. That's just pure unethical.
But, again, burn-in is not "supposed". It might only be a very miniscule amount with most drivers, but it is still happening. It's been consistently tested and documented many times (as per the
www.gr-research.com link I previously provided) and is the accepted norm with fresh/raw drivers of traditional design. Again, the overall effect will depend a lot on the implementation, and what range of the driver's usable bandpass is called on.
I don't start to design, test, and build my loudspeaker crossover networks for my DIY home & studio monitor speaker builds until I have measured each driver after a ''break in'' period and find no further significant changes in the measured specs.
But this is exactly why I want to test my burned-in GQs with a fresh, out-of-box set. Might be interesting...or not.