Yup, really dig how they sound now. Some impressions in the post above the tweak pics if you missed em. And, as mentioned, I think the left ear measurement (raw 1 and 2) better represent what I hear on the PM-2 at up until around just before the 10KHz area. Slightly smoother transition, bit more filled in at 5KHz than what the averaged results show in the end.

One downside to stretching them out is that they no longer fit in the carrying case. Haha, oh well.

   Everyone knows about the controversy regarding the sound of OPPO sets, especially the PM-1. I had a chance to listen and measure 6 different sets of OPPO headphones and came to an interesting conclusion regarding their quality and sales/marketing tactics.

   Here is how it all started:
OPPO had launched their PM1 set in Singapore with a lot of noise and fanfare. One of the things that stood out for me was the twin female models who were supposed to represent perfect matching of their planar drivers. Great idea, especially if it tells the truth, right?
   By that time I only measured two PM1 sets, and of course none of the drivers matched perfectly so I thought oh well, probably just my bad luck. Both sets sounded unsatisfactory, I started modding and forgot about the initial measurements for a while, up until I got a hold of one of their reference units. Wow, what a different story it was. This happened well before the release of PM2 and all the alternative pads. Reference set sounded and measured waaay better and my impressions of its sound all of a sudden started to correlate with those from Tyll.
   This should have rang a bell for me back then but I let it slip....again. Then PM-2 came out, I purchased two sets, all the drivers measured different but I know how it is with planars, cute twins at the presentation is one thing and production reality is another, so I just kept on modding.
   Revelation came when I was given a chance to play with a set from Darin. He made arrangements with OPPOs management for a set of PM-2 to demo his "Out of your head" software. What a surprise it was, both his drivers measured almost identical and much better then all of mine. Finally I decided to put two and two together; the twins and graphs at the Singapore presentation, all the raving reviews, reference set that I was given a chance to listen/measure, Darin's PM-2, Tyll's PM-1 and finally Purr1n's PM-2 that for whatever reason they would not give him at the LA meet but had to send from headquarters the very next day.... . 
   Well, maybe the whole thing is just my imagination but I personally have never met one single person who liked OPPOs as much as all the reviewers did and I am talking about many people I met for the first time, who's opinion should not have been biased and who were just regular attendees at multiple events I have visited since official release of these headphones.
     Driver variation or a marketing strategy, what do you pirates think? 




   

I do wonder if the PM-1 have gone through silent revisions. Sennheiser did the same thing with the HD-650.

600s too. N sold me his newer revision and has an older one now. I prefer the newer, personally.

Cute twins and shiny wooden boxes. Sounds like hi-fi audio shenanigans.