Defoaming HD580/600/650
Sep 30, 2009 at 10:44 AM Post #2 of 5
I did it to my 650 a long time ago. I instantly liked the change. The biggest thing to me was a more open sound, sorry for the generic description. I let two other Head-Fiers listen and they both agreed that it was an improvement. They both had 650 also...one had me mod his on the spot.
 

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