I just finished my week with the Oppo PM-3 and I am VERY impressed. Now, I've to preface my impressions with the fact that I'm a complete amateur when it comes to mid-fi/hi-fi headphones and am just getting into the audiophile game. All the songs I listened to were either FLAC files streamed from TIDAL or compressed mp3 files streamed from Google Music. I've had the chance to audition some headphones in the same price range like the B&W P7, the Master and Dynamic MH40, Sennheiser Momentum 1 and 2 and the Bang and Olufsen H6, albeit in stores and thus for a much shorter time.
Straight out of the box, I was struck by how beautiful these headphones were. The images don't do justice to how nice these look! They still don't look as good as the MH40 or the H6 (IMO), but they're pretty darn good nonetheless. The leather-like material on the headband and the earcups was very soft and supple, and super comfortable on the head and the ear. However, I did feel that there was a little too much clamping force on my ears and had to adjust them around a little more than I would've liked to get a near-perfect fit. Also, I did notice my ears get warm every half an hour or so and had to take the headphones off for some air. Just minor concerns and definitely not deal breakers. Compared to the other headphones I've tried, only the H6 surpassed the comfort levels the PM-3 offered, and this comes with the caveat that I wasn't able to test the H6 out for as long as the PM-3. Additionally, the PM-3's didn't have any cable noise and though the cable had some memory associated with it, I thought it was fine for portable use.
I always test headphones out first with Led Zeppelin's "Ramble On", looking for how clean the bass line is, how well-articulated the guitars are, how forward the mid-range is and if Robert Plant's voice soars over the music. All this with a good soundstage and I would've bought the PM-3 then and there! The bass was oh-so clean, the guitars were creamy, I could hear layers in the rhythm section I had never heard before, but that sparkle in Plant's voice was missing with the treble being a tad-bit rolled off (as several others have noted). Man, was I so disappointed! Nonetheless, I knew what to look for from these headphones and carried on with my other songs. Only the H6, IMO did a better job and till date has given me the best "Ramble on" experience, with amazing treble and a superior soundstage. As expected (and disappointingly so), the same issues were present when listening to Queen's "Under Pressure" and Iron Maiden's "Dance of Death", "Fear of the Dark" etc. I will say though that the clarity in Bruce Dickinson's voice was wonderful to hear, something I've never experienced in the past. One BIG positive though was that I truly understood why Led Zeppelin recorded the drums for "When the Levee breaks" in that big old house instead of a studio. The intro drum beat gave me the chills and I could feel the "If" (first word in the song) move from left to right. It was f*kin awesome \m/
I am happy to say that no matter what I threw at these headphones, they just enhanced the music and took the song to a whole new level with the only drawbacks being the lack of the sparkle at the top and the lack of a good soundstage. This signature though definitely helped with acoustic/semi-acoustic songs like "Sitting on the dock of the bay" by Ottis Redding, "Hallelujah" by Jeff Buckley, Johnny Cash's version of "Heart of gold" and Mofro's "Gal Youngin". I felt like the artists were right next to me, belting the songs out and I literally had goosebumps after all these songs. The PM-3's also did great with The White Stripes and The Black Keys (the earlier albums). The Chulahoma album (songs of Junior Kimbrough) was a special treat on these 'phones and amplified the raw quality of the blues these songs attempted to reproduce.
Finally, I wanted to see how these headphones did with more contemporary music, that relies a little more on editing and sound processing. Daft Punk sounded great with wonderfully clear rhythm sections. DeadMau5 and Skrillex sounded particularly exceptional in these headphones and I loved the detail separation they afforded with songs like "Ghosts and Stuff". Having heard this song on several other headphones mentioned above, I like the PM-3's reproduction the best, with the others sounding too boomy (with the exception of the H6 of course, which sounded a tad thin and sterile). Tame Impala's "Feels like we only go backwards" and "The less I know the better" sounded out of this world, with the PM-3's bringing out the best in the atmospheric quality of the songs, despite not having a great soundstage (this was a little confusing to me, maybe someone more experienced could elaborate as to why?)
If not for the mellow treble and the lack of soundstage, I would've bought these by now. But I want to now audition the H6 for an extended period of time before deciding on one of them. Looks like it's going to be a dog fight! Once again, thanks a ton to Chris and Oppo Digital for this opportunity.