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I know I'm posting this in the UM3x forum hence there will be a little bias, though I want to ask.
What made you guys choose the UM3x over the SM3?
Thanks! any advice/suggestions would be great as one of these 2 IEM's will be my only purchase for the next 6 months! :O
UM3X would be a better choice for those looking for a dryer, more analytical presentation. SM3 sounds smoother and also has a bit more presence in the treble (I personally find UM3X a bit lacking in treble presence), but SM3 is not as good for analyzing music because it is a bit less focused on detail and more on overall musical presentation. UM3X will give you lots of details and superb separation, but are not quite as warm and sound more closed in and focused with less emotional impact. Personally, I think that technically they are on about the same level, but SM3 was engineered more for music listening (I mean for pleasure), whereas UM3X was made primarily for professional applications IMO. It's not that SM3 covers up any detail compared to UM3X, but that the dryer sound of UM3X makes details more apparent and easier to pick out. That being said, I found that I had a hard time actually enjoying music with UM3X - I always felt like I was picking apart the recording rather than listening to music as a whole. SM3 on the other hand, strikes a better balance between fun and analytical presentation in my opinion, being able to sound both pleasantly coherent and emotional and at the same time quite flat and uncolored and full of detail hearing which just takes a bit more effort than with UM3X. Thus, I personally prefer SM3.