I originally purchased Reference 4 to use with my AKGs K702, and I've loved the sound ever since, for mixing/mastering and also for daily use. The sound is very clear all across the frequency range, defined and not harsh in any way.
Recently I purchased the Sony WH-1000X3 for daily work use, and I noticed the calibration profile for these headphones sounds different than my AKGs, particularly the bass response, which is a lot less pronounced than before (these headphones are naturally pretty bass-heavy) but also less pronounced than the AKGs with correction on. The AKGs are naturally not bass pronounced, so the calibration profile balances it out pretty well.
Could this be because of the different nature between these headphones (open back / closed back), perhaps bluetooth losses, speaker voicing (the Sony sound harsher with the correction enabled) or simply the headphones measured for the calibration profile are different than mine? Or a combination of all of those...
I'm simply asking because I'm trying to figure out which one is more "neutral sounding", since I've been listening to the AKGs on an almost daily basis for about 3 years now, and that has been my idea of a neutral sound. Now the introduction of these headphones with a completely different signature is having me doubt my own ears!