[alexdi]

No, the other two are as smooth (HD600) or smoother (400i). It's an intentional dip in the high frequencies. 
 
http://www.innerfidelity.com/images/OppoPM3.pdf
 
http://www.innerfidelity.com/images/HiFiMANHE4002014.pdf
 
http://www.innerfidelity.com/images/SennheiserHD600.pdf
 
It doesn't mean it's bad (some people may prefer rolled highs; this is almost the definition of a "warm" sound), just that the difference is apparent and I didn't go for it. 

 

[mark2410]

heah my ears just say tha the 600 is more grainy and the 3 extends pretty well.  though it fairness my hearing treble responce i dont think is entirely the same as is typical for a human.  i know im relatively treble sensitive.

 

[fubar3]

Been using new PM-3 for a few hours and I am pleased so far.  I consider it an upgrade from old ATH-M50 and AKG K141.  They are good enough but I find the PM-3 more revealing of details in the music. I miss having replaceable ear pads. The AKG came with optional velour pads which I prefer, at least for those phones.
 
I like the denim carry case.   Did you notice that "oppo" turned around looks like "oddo"?

 

[fubar3]

  Been using new PM-3 for a few hours and I am pleased so far...

Why PM-3?  Well I was reading "Battle of the Cans" in April edition of MaximumPC where DT1770 PRO had perfect soundstage but OPPO PM-3 was more practical with less cost.  So I decided to try planar magnetic.

 

[CruCavage]

Hello! newb here.
 
I wanted to ask anyones opinion on exchanging my BeyerDynamic DT 770 Pro 80 ohm for the Oppo PM-3s. I have the 770s powered by a FiiO E12 amp into an Astro Mixamp (optical into) Xbox One. Overkill, I know. Also the only way to achieve Dolby surround. 

I have the (open back) Philip's Fidelio X2s. They are amazing. But I am looking for closed back, primarily for gaming and music. Though the 770s have great sound, the non-removable cord and less-portable design, inspire me to get the Oppo's. Being an amateur, I'm interested in hearing Planar tech as well. 

Cons I have read about the Oppo's are minor comfort issues and not as much bass as some prefer. I'm not a basshead but I do like a little kick (the 770s have fantastic bass). The E12 amp has a bass boost and is more than sufficient for games when it's needed. 

Thank you. Any information is appreciated!