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Originally Posted by toanaldino /img/forum/go_quote.gif
I just received a new pair of UM1, for some reason it feels really dull and flat.
Does it need to be burn in first? How can i improve the sound?
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A few questions and some thoughts (I have never heard the UM1, but had the UM2, so take this with a grain of salt).
#1 have you used IEM's before?
When I got my UM2's I was totally dissapointed. It sounded like I was under water or had a pillow over my head. I had been using UE SF.5's for about a year, so I was comfortable with IEM insertion and seal and was comfortable wearing them - so I did not think that was it.
Many here say there is no burn in with IEMs like the UM1 or 2 (or any that use the type of drivers they have), but Earphonesolutions.com says otherwise. Personally, I think that burn-in really helped the UM2's. I ran pink noise through them all night for a few nights (8 hours a night) and probably a few hours each day. In just a day or two I noticed a difference. Maybe it is real, maybe it is not.
It could be that one's ears adapt to a sound signature. It could be that one learns to align them better in their ear. It is probably a combo of all 3 factors.
Bottom line, in a few days they in MY ears went from dull and dissapointing to really top notch. I was a big fan of their sound - plenty clear. To be honest, I always found them a bit inconsistant, where they were amazing on one song and not all that great on another. I would listen to the same stretch with my UE's and they would be much more consistant.
More thoughts: Tips and fit are everything. It is easy to get a seal with the UM's if you have various tips to try. That will take care of the bass. Alignment is another factor that is critical to the mids and highs. I would find a slight touch or tweak to the UM2's made a word of difference. I found the foamies WAY to easy to not get perfect and the pillow sound would return. I found the same on full tri-flanges. Bi-flanges and the shure rubber tips were best for me. I think this issue is partially due to the design of the UM's (and shures for that matter). The tunnel to your ear (or the opening) is just very small. It is easy to sort of shut down that path when using foamies. The UE super.fi series has a much larger opening and I think that helps. However, I think the large tip of the UE's makes them less comfy and harder to fit.
In then end I went with customs (yet to get them yet, I go get impressions today).
I think you will end up getting much better sound out of the UM1's and will like them very much. I plan on getting some for a spare set and for my wife to use from time to time.