This is a pretty dead thread, I get that. But I recently came across something that I have not heard anyone mention. So I've been messing around with my M50x lately. After falling in love with my HD600s I was at one point "over" the M50x.
Since the M50x are my only closed back at this time I decided to try new pads from Brainwavz. The normal (non angled) pleather pads. The first thing I noticed was the large drop in bass that everyone talks about. I also noticed a bit of an echo or cupped hands effect that I did not like. This bummed me out at first because the pads were comfortable but really messed with the sound signature of the M50x.
I realized that everyone was correct, the larger pads made my ears further from the drivers which changed the sound. Then one day something dawned on me so I gave it a try. Here it is...
*Instead of mounting the HM5 pads into the slot that the original pads set in I pulled them past the slot & around the outside of the housing. This pulls the HM5 pads closer to the driver. It also slightly spreads them open a bit allowing more room for your ear.
This one change made a big improvement & brought the sound closer to what the original pads had. Bass is not 100% back to original but I'd say 90%. Mounting the HM5 pads into the slot like normal gives you 65%-70% bass compared to the original. These are just estimates according to my ears.
Here is another tip:
*I cut out the middle foam from the original pads & added them behind the thin foam the HM5 pads have. This tamed the early reflections & smoothed out the slightly harsh highs.
I can honestly say I am now enjoying my M50x more than ever. When on the road or out in public I really love these cans again...of course when I'm at home nothing compares to my HD600s through my Crack w/Speedball but that's another topic haha.
Hope this helps anyone out there that is disappointed with the HM5 pads on their M50x.
Happy Listening Everyone