Unscientific measure? I just got a sound meter app on my phone and played with the fans on my PC to get to different dB levels.
My PC is about two arms lengths away from me and between it and a mini fridge in the hallway outside my room here (20ft/6m or so away) my phone was reading about 28-30 dB. I can hear both without headphones on of course. It's not too loud, it's like whisper noises, background noises...Fans.
I can't hear either with the Elegias on my head playing no music at all.
I turned up the two exhaust fans on the PC up from their 500rpm to like 1500rpm and I was at about 40-44 dB somewhere in there. I can hear the fans through the Elegias now. Not terribly loud, but I could hear the fans. So I took it down incrementally and found that if I listened very carefully I can hear the fans starting at about 34 or 35 dB. I actually don't usually have both fans running at 500rpm normally when I'm not doing much on my computer. So the Elegias effectively isolate everything I normally have going on around me.
If I was gaming, I'd for sure hear the fans because now the GPU fan would also be on and I bet the noise level would be much higher (I haven't measured actually). I have actually used the Elegia while gaming. I like listening to the music in Forza Horizon playing that to chill out late at night. Or I'll play my own music while driving around. I definitely don't hear the computer fans or GPU fan while music playing
though surely it must have some sort of affect since if I wasn't playing music I now know I would for sure hear the fans through the headphones.
Still, I would consider Elegia isolation to be good.
I realized, I do have the NightOwls as well. So I just did the same test with them. I can hear the fans at 30 dB and I'm going to say maybe not at 28 dB or only if I listen
very hard.
I'm using the protein leather pads on the NightOwls and the Dekoni LTD Stellia Pads on the Elegias.
I can hear myself typing (Apple magic keyboard, those thin keys) with the NightOwls and for most keystrokes not at all with the Elgias. I have to press a bit harder and only a stray keystroke or two can I hear with the Elegias if I'm not and again I have to listen carefully. Keystrokes are ranging from 30-34 dB so that makes sense and fits with the level the fans were making when I first was able to start detecting sound with the Elegias.
I have
very good hearing too btw (but I'm good at tuning things out). The kind that I say "someone's here" and my wife thinks I'm nuts until the door bell rings a few seconds later. What I hear most when I put the headphones on without music playing is the headphone cable, my hair against the earpads, and my own heartbeat. So it takes about 34 dB of noise or more before that outside noise is noticeable and overtakes that ambient noise inside the headphones.
So for what that very unscientific test is worth...There ya have it. Elegia are absolutely more isolating than the NightOwls. By a little.