Here we go, found a quote from here…
Cymbal clash and drumstick hit come across as clear and concise in the treble range. Much appreciated again and one in which I can enjoy the sound. I did find myself turning the volume down though on the Los Lobos album a bit over other headphones. This is not a knock on the headphone, just a paucity of my ear-connection to the headphone. At lower volumes, I can listen for hours without fatigue. Many planar’s have trouble with the higher end, and the PM-50 isn’t free of that, no. They just control the upper end pretty darn well. Treble is my well-known Achilles, and this isn’t off from that. Up to about 4kHz they are a bit too biting for me, but thankfully roll off from there. I do have to turn the volume down on some albums or songs as a result. A shame really for some of those are amongst my favorites. Consider that to be a shortcoming of my ears, not the PM-50 by any means.
I would suggest you eq that if you’re super treble sensitive. Or head towards amps that minimize that problem. My Geshelli equipment does a great job. Liquid Platinum is a bit harsher in the treble right now, but much sweeter everywhere else. <---- sundara needs no eq imo, is a nice happy flat line mostly
Here’s a quick comparison. I plugged in my 990s and PM-50s in for Highway to Hell (on the Highway to Hell album) from ACDC and cranked the volume a bit. My ears forced me to turn it down with the 990s. The upper edge of the vocals was what I’d describe as biting. The PM-50s on the other hand handled them much better. There’s still a noticeable spike if you’re looking for it, but it doesn’t pull you out of the music immediately like the 990s do. <------ also did this with sundaras. Same deal, except since the sundaras are more laid back it was even easier, but slightly less engaging than the 50s.
Hope that helps!