[Capt. Z]

Since I've modded my Grado SR60 with some dynamat like stuff inside the plastic housing with good results, I was wondering if anyone tried to do some 'resonance' control on the 580/600/650 since there is plenty of plastic surface inside the headphones.
 
 

 

[Capt. Z]

Just did the mod myself.
 
Low bass has decreased, mids are still warm and relaxed, Bass is definitely more controlled. This shows that the plastic frame-work did resonate somewhat and added some muddiness to the sound. This gives the headphone a clearer sound and better sound-staging.
 
Next week I have some Mogami cable coming so I can make myself a nice headphone cable.