I found the IE8 to have more bass, and also more controlled than UM2. Details wise I think UM2 is better.
But nowhere near my ER-4
But nowhere near my ER-4


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The bass after more than 100 hours of usage is noticeably much lesser in quantity at the lowest bass setting. Soundstage got wider and it's very natural.
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The bass adjuster, however, is a useless gimmick to me as the bass is already sufficient at the lowest level, and anything above is unnatural. |
| The burn-in for ~ 60 h (white & pink noise, freq. sweeps) didn't make any noticeable difference to me, but maybe my memory deludes me (I have no way to measure). |



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hey, lelek45
how long did you burn in your senn ie8 for it should not be boomy or lacking in transparency i have custom 3, the senn ie-8 is more open and resolved then my custom 3. i think you probably need to burn in about 150 to 200 hrs on senn ie-8 |

they changed the sound signature totally to me, and not dark any more at all.