Ok, here's the thing: these headphones are incredible!
I covered the bass reflex ports, it seemed like it lowered the bass a little, but I felt like I'm losing soundstage. So it was like a no go, too much of a compromise. I begun to grow impatiently as I felt that these cans have great potential, the vocals sound so real, so alive through them, kind of scary with some recordings. Started to read a little more on them, and found out that someone on this forum said that changing the cable gave him like a new pair of phones. It was hardly believable but i said fuc__ it, I'm willing to try anything to make these babies sing and I bought a QED Graphite cable to replace the stock cable. And it did it: it's like I have new superior headphones! I can't explain why and how but it seems that Philips ****@d things up with the stock cable and by the way that stock cable has so high microphonics that I could hear my heart beating thorough it. So, to anyone owning M1, try, just try changing the cable, see how it's like. The bass is tamed, the so much missed after highs are there, everything is so in balance.