As for ES3X, Just I did not have time to try. So I made a quick test, by pressing pause and then increase the volume.
ES3X cause hiss almost over the half way of the volume has past. There is no notch on the volume so I can't say it exactly but I think it is almost half way to one or two o-clock for the ordinal dial volume.
I think this is a good result for the 124 dB sensitivity IEM.
Originally Posted by GreenLeo
Finally, I really hope someone may input if ES3X hisses with the 801. I've already prepay for the 801 so I've no concern. But other ES3X owners may want to know because one of the target customers of the 801 should be the ones who own top IMEs. However, I suspect ES3X does hisses because Sasaki said nothing on this -- I hope that I'm wrong.