Quote:
Originally Posted by
rhythmdevils 
I think the HE500's bass response might be their biggest weakness. It extends really low, but it's kinda flabby or wooly. Anyone else?
Yes, I agree! Compared with HD-650 bass is a little flabby, to my ears (please, don't flame me, I do realize that bass on HE-500 is way better than HD-650 - I am talking here about how controlled it is, and I believe is a little flabby).
I have found that there is a resonance from the metal screen mesh on the back around 300Hz (see here). Maybe this contributes to the flabby bass. There is also a less nasty resonance around 50Hz from the cup.
Fortunately, you can easily remove the metal screen mesh (instructions from the man itself here), leaving the driver with no damping from the back. I have tried it briefly and I think that I liked what I heard! Of course it is not wise to leave the back unprotected, so I am planning to replace this metal part with something else.
Edited by plin - 2/19/12 at 11:50pm