I think he means that one may add the HD600 grilles to the phones and make them identical to the HD600. - At least that's what I've read.
What I don’t get and would really like to know is what he means in combination with the MK III.
Is this an extraordinary combination of HP and Amp?
I’ve been trying to find out since he posted this, but I don’t get it.
I hate the time difference at the moment, I am very curious.