My grado ps500e and sr325 sound great through the macbook pro. PM3 not so much. I was blaming the phones (because my other phones sounded great) and just thought others that had reviewed the pm3s were just happy they had some ok sounding Planar headphones on a budget. I couldn't understand the hype with the Oppos. I didn't know if it was because they were closed (hell, my Momentum 2s are closed and sound great) or just not a great sounding phone.
I had packed the PM3 up to sell because they just didn't float my boat. I tend to like a dark sound but with detailed/airy treble. There was something missing and I never really reached for them much at all except for very specific tracks.
I ordered the modi MB/magni combo as my first headphone dac/amp since 2008 (lost $6000 in hometheater/audio equipment in a flood) and wow. Just wow. The soundstage is way better and the airy/detailed top end is back. I'm a/b-ing with my macbook pro and it is a night and day difference with the PM3. The grados have improved with the M/M stack but only slightly. The PM3s, however, have just come to life. I now see what other users mean when they say some phones need a good dac/amp to get them to sound great. They are becoming neck and neck with the grado ps500e, and dare I say, starting to like them more and more, maybe becoming my favorites.
I've heard others have the same complaints about the PM3s and have read a few bad reviews and I'm wondering if it was just because of the dac/amp.
I'm going to keep them. I love them. I'm being very unproductive today.