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Well, I didn't feel like the treble is at all emphasized the UM3X. In fact, I felt that it was a bit recessed. I don't think bass is emphasized either - maybe just a little.
Yes and no. Now it does depend on your personal ears. For how I hear and through frequency response testing I've done with a lot of the earphones I've owned, The UM3X comes across largely well balanced but with maybe a dominant yet even bass signature and a specific treble presentation. Now frequency responses within a few dB is casually flat enough where we don't notice it. If you have a 10dB peak somewhere it's quite obvious. If you have a few dB bump or dip over an area, there can be generalized perceptions where the earphone is a little bright, warm, or whatever.
For reference, here's a comparison graph I've done of a slew of recent earphones I've used. Each was done by EQing each earphone at a medium listening volume using a pink noise test track. With the pink noise, I EQed each earphone to what I perceive as flat. It's something I've done for a while and have generally liked the results. It's a good tool for figuring out the quirks of an earphone too. Some have a peculiar sound, and EQing shows you why.
Now this is how my ears hear these earphones. My perception is different from others, and perception will vary by volume, how good your ears are, and even how experienced you are with picking up smaller variations. At the very least, this is a good indicator of how some of these products relate to each other. The dips for the Custom 3 and UM3X seem to be a crossover choice and gapping over the crossover range. Now this isn't an exact science. Unfortunately our ears change over time and our perceptions adjust. An example of this is an older graph I made a good half year back.
It's pretty obvious the perceptions are a little bit different. The older graph certainly had a milder perception of bass, but I was also mainly using bass heavy earphones. I did EQ this older set a little more coarsely. I was also aware of the midrange dip in the UM3X, but I ignored it at the time. I was really doing a quick comparison. I went through the EQing a number of times, but I didn't try to EQ in great detail. In the more recent testing, I was using a lot of bass light earphones, so any bass heavy product would certainly appear bass strong. I also did EQ in greater detail and made extra effort to shape the EQ appropriately for the earphone. It's not always a simple parabolic curve. In both of these test groups I owned all the earphones at the same time or at least a good portion of the test group and the other portion very soon after and used most of these back to back during testing, so I never had any specific favorability. I will reiterate that variation within a few dB isn't a big deal from a perceivable perspective. It's the big peaks or valleys that create that interesting sound signature and coloration.
It may also become obvious why I say earphones like the RE252 and MTPG are very flat. The SE530 is pretty flat, but the bass just rolls off way early. Upper end treble is well extended but does sound slightly recessed (crossover phase offset perhaps or some side effect of the time domain). My favorites in terms of balance and working well for a wide variety of music have been the RE252 and MTPG, but the Eterna, Custom 3, Triple.Fi 10, and CK10 are great options that can be smoothed out without significant hassle. I've liked the UM3X too, one of my favorite and very detailed and revealing earphones, and it does come across well balanced. Even though some of these come across well balanced, there is some coloration associated with their gearing. It may not be obvious until you do start EQing and realize how it sounds flattened out. Then you step back and realize how colored the sound really is in the first place.
