Sennheiser HD6XX would need to be handcarried from US to avoid customs , will cost you about 14-15k sans the amp. Another OTL amp will set you back by about 20k , but at 35k this will trump the Sony XM3/XM4 which cost 16-21k at a level unfathomable for someone moving from Sony/M50X to HD6XX. It can be considered either as an investment or step one into a big rabbit hole. depending on how you can control your itches
The KZ ZS10 are known to be bright/sibilant to quiet a few friends/fellow members online , I feel your preference leans towards this kind of a signature. Personal preference wise I would rate M50/M50X as the worst of the Headphones I have tried by a good margin due to a variety of issues. Is your listening genre specific or you listen to a variety of genres , that would matter quiet a bit overall. Now coming to your pointers
A) All of us look for the best SQ what our budget can buy, but what is best for one need not be the best for another. In general terms people usually use warm/neutral/bright to describe the sound. Warm is generally high on bass and emphasis on vocals too , neutral is no emphasis on anything particular and bright where the instruments will zing through the presentation. If I had to take a guess you prefer the brighter side of the spectrum based on the KZ ZS10 but its highly likely you have not listened to the alternatives and like the ZS10 as they seem better than the M50X. If i had to recommend headphones I would probably recommend the Beyerdynamic DT770 Pro to you as that might suit your taste. O
B) There are hardly any wireless headphones under 20k which sound great, lot of wired options under 10k would in all probability better them. But still the convenience of bluetooth, ANC is something to be considered and if they are valued at 70% in your weightage than its worth considering the Sony 1000XM3 , I had auditioned them long time ago and to me they are certainly enjoyable but at the cost of missing out on certain no of things. If you dont travel much and dont need to carry them across then skip bluetooth and ANC
C) Trying to reach out to people in your locality and auditioning stuff is the best way to expand your horizon. Tough now due to Covid but there is no better way to understand your preferences other than auditioning. The lack of such options here is what makes us make random purchases and later repent
You will need to spend on a headphone and a good dac/amp to experience something worthwhile. If possible save up for about 30k and then look up for wired open-back headphones + dacamp (if its for home use) , trust me you will be amazed at what you had been missing out on once you get a good headphone and a dac/amp
. Was already in the stereo rabbit hole, now this. Killing me (my wallet).
