IEMusic
Headphoneus Supremus
IMHO, if looking for a single DD stage monitor, the ISN D02 sets itself apart as a great choice for isolation. The reason is, it’s the only single DD IEM that I know of that utilizes a sound tube, so the air in ones ear canal is still separated from the air in the IEM and the air coming thru the vent. With a foam tip and deep insertion, I think it provides the best isolation of any of my single DD IEMs.