IE80 with tape mod and a nice amp is indeed a noticeable combination.
It was interesting to read these previous comments about the level of bass knob settings under tape mod.
I use it on 20-25% of bass with tape mod, but I have to admit, I almost always turn the bass switch on on my amplifier.
Tape mod has more benefit than draw back, it is out of question.
IE80 (with tape mod and a nice amp) indeed sounds very nice. (Have to admit, I own custom tips, so I I do not have to face the struggle of finding good isolation). If I compare IE80 to Fidelio X2 with the same player and external amp, I have to say, they almost are on the same level regarding listening experience. IE80 (With amp and custom tips) sounds very clear, tight. Great bass extension. Very good 3Dspace and clarity for an IEM. With very nice bass.
Fidelio X2 however sounds much more natural. Space feels to be real, all instruments and voices are much more natural, There is more space. More natural, but a bit loose bass.
IE80 is more accurate, but feels more artificial. Even with a good amp.
X2 is closer to reality.
Both are very enjoyable, and good value for the price.
*I am lying. With the IE80 I do not need to switch the bass on my amp. It is sufficient without it.
Also have to admit, IE80 sounds so artificial after a while, that I want my X2 back. even though the bass is slightly looser.
Naturalness is simply hard to beat. And an IEM will never have a chance compared to an opened back full size hp.
Very nice try though, Ie80, have to admit.
(Ok, I have to admit, nothing comes close to a nice source+amp+opened hp combo, except speakers. But that doesn't count as they are at least 10x more expensive,)