Dynamat is REALLY not the optimum material for this application. It's too thick and heavy and it costs too much. It's a serious case of overkill IMO. I've tried both Dynamat and Spectra Dynamics Magnapads (small version of their Deflex material made for the back of speaker magnets) and they both adversely affected the bass. I suspect that the thickness of these materials completely changes the parameters of the headphone. I've been using Lightweight Vinyl Sound Damping Sheets from Parts-Express to damp speaker enclosures for years and the stuff works. Does it work as well as Dynamat? Well, not on speaker cabs and cars but on headphones? Yes, yes it does. I've used it on several budget phones and not only did it get rid of any creaking noise but it also helps isolation and cleaned up the sound considerably. Why this stuff is better for headphones: 1. It isn't nearly as thick and won't change the parameters of your headphones nearly as much as Dynamat. 2. It is WAY lighter so you don't feel like you're wearing some big, clunky vintage cans. 3. It costs way less money... need I say more? Even better is two or three coats of VB Quite Kote. Seriously, if you have the patience to disassemble and tape up your phones then this is the way to go. It doesn't change the parameters at all, is just as effective as the vinyl damping pads and is even lighter. Another alternative is automotive undercoat. Wal-Mart sells some that is labeled "Pro undercoat and sound deadener" or something like that. If you use this stuff make sure you buy it from a place where you can smell it first (everyone sprays the price labels at Wal-Mart) because some of it smells like tar or worse. If you smell it and it smells like spray paint then you're good to go. Yet another alternative is truck bed liner. Either the spray or the brush on stuff will do but I prefer the brush on stuff because it dries much harder and will actually strengthen your phones. I like to use it in gaps in the plastic molding on budget phones - it really helps make them sturdier. Well, sorry for the rant - just wanted to give my thoughts/tips on the matter.