Accidentally, I found a foam-removing mod for HD650 in this forum. I think it started year or two ago.
Since I haven't seen a post about this mod, I will bring it up again.
As a matter of fact, I removed the inner foam pad and the outer (small circle) and covered with pieces(same size as the foams) of a panty-hose (actually knee-highs).
In the old thread, some said that there was no difference, but I could tell a lot of difference.
I found some step-by-step pictures here
For those who have HD650.... it was worthwhile for me.
Since I haven't seen a post about this mod, I will bring it up again.
As a matter of fact, I removed the inner foam pad and the outer (small circle) and covered with pieces(same size as the foams) of a panty-hose (actually knee-highs).
In the old thread, some said that there was no difference, but I could tell a lot of difference.
I found some step-by-step pictures here
For those who have HD650.... it was worthwhile for me.