I think you know the answer hahaWould you recommend these to someone who has the HD650/6XX/560/660/660S2/630/58X
But seriously, thanks for being an awesome customer. That's a great collection!!!
I can confidently say that the HD 620S has a unique tuning among all of the cans you just listed so there is almost zero redundancy from an overall signature perspective. Of course, I hope you get to try them as your opinion is the Golden one
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