Even with M20 module? I use both Fourte and U18t daily for my commute and never bothered by the surrounding city noise. To my ears, their isolation is pretty good.Thank you for this @fiascogarcia so i owned the U18s and was not able to enjoy them, I tried everything, different cables everything, but wasnt able to because it’s sonic performance is similar to an open back. I don’t listen to open back because in order to hear the music, I would have to turn it up louder than the background noise and I couldn’t, too loud. Which made me believe you guys are the ones with superhuman hearing to be able withstand that so ci performance.
As for the volume level on my WM1Z, I use 52-60 (High Gain) and 72-85 (Low Gain) on both Tia Fourte and U18t. These numbers are for Balanced output. I prefer high gain sound.