I am in the market for an active NC wireless headphones and based on my research, these are the best ones to get overall compared to QC35 ii and B&W PX. In order to fund this purchase, I am thinking to sell off a couple of my current non-BT/ANC headphones. I've read enough to know that for a wireless ANC headphones, these sound very good. But I am curious to find out how well they perform sound quality wise when wired without taking BT and ANC features into considerations (i.e. using them as a regular wired headphones). Reasons being that I want to replace one or two of my HPs in my current lineup with these, and if I am not losing a lot of sound quality, then I am happy to sell of 2 of them to fund this. I want to know what traditional wired headphones' sound quality would compared to the XM2/3 wired. I assume almost half of the cost of the XM2/3 would be put towards the "extras" such as BT and ANC. Phones I am considering selling to replace with the XM2/3: HD600, HD598 and/or AKG K551. I assume a wired XM2/3 won't sound as good as a properly amped HD600? Does it sound at least as good as a HD598? How does the XM2/3 wired sound quality compared to other popularly recommended wired headphones (M50x, DT880, DT700 etc.)? Would appreciate any comments on this from you guys!