How did the factory hybrids change the sound? So far I've tried the HM5 pleather, MrSpeakers Alpha pads, Audeze lambskin pads, and some ZMF leather pads. (I only poked holes in the HM5 pads, I'm not crazy, lol). The HM5 took away a little bit of bass, brought up the mids, and opened the stage just a little. The other 3 are angled and killed the bass more than the HM5s did. The Alphas even made the headphone seem slightly bright which I didn't think was possible. The best sound I got from all of them was when I smooshed the Alphas down to make them essentially a flat pad. The bass returned but kept the mids and highs. Obviously I'm not going to constantly smash the headphones into my head all the time, lol, so for now, I'm using the HM5 pads. I guess what I need is a flat pad made of some good quality leather with a larger ear opening than the stock ones to get the sound I want. ZMF Universe pads are lambskin and almost flat, and Brainwavz makes a flat HM5 in sheepskin.