What about taping the bass ports?
Right now I have them playing an electro-house playlist in another room for at least the next 3 days (they just arrived today, like what I heard besides a certain shrillness), after which I will take a peek inside. I just know that with the bass ports taped, it's supposed to help with the bass with HM5 pads.
Also, any luck for anyone finding any HM5 pads recently? >w>
The HM5 pads aren't hard to find - they are pads for Brainwavz HM5, so mp4nation is the place to get them. I've said it before though - for me the stock pads are the best sounding. The other pads reduce the bass a lot and ruin the depth of the soundstage that for me is one of the strongest sides of s500. Taping the ports boosts the bass but ruins its texture.