Reading your comments reminded me of some little details I couldn't pin down on the UF Hifi hybrids. Just did a back A-B listen of the two phones via a splitter using my LG G6, playback on FLAC files ripped off original CDs.
First things first, mine are :
I) Urbanfun Hifi hybrids (1BA + 1DD), second revisions with the grey cables. Foam tips.
II) Urbanfun Beryllium ( Single DD) in the fun colour scheme. Standard Silicone tips from package.
I now understand why you said the UF Hifi have 'elevated bass' or pronounced mid/upper bass. When I compare between the two and then I did a third short take on the CI880, I came to conclusion that the UF Hifi had a very weak sub-bass. Almost to the point of 'missing'. Which probably made the mid/upper bass sound elevated to you. When I played Ministry of Sound tracks and some from Deep Dish, the sub-bass thump was all there on the Beryllium and the CI880, the latter being less pronounced but the UF Hifi just didn't have much of it.
Bearing in mind that between the two earphones, I was comfortable on the UF Hifi at 30/75 volume. But I had to turn the volume down to 20/75 on the Beryllium for the techno tracks. The CI880 being closer to the UF Hifi at around 27/75.
Then I played Tchaikovsky's Violin Concerto by David Ostrakh under Eugene Ormandy. A piece I know very intimately well. A-B between the two. And later with the CI880.
There were a few instances where there with some cellos and a few double-bass parts in the 1st Movement. On the Beryllium, it was all there, at 25/75 volume. The UF Hifi had to be cranked up to 33/75 to catch glimpses of those instances. And it wasn't very clear either. I played back the same segments on the CI880, they were there too, albeit not as pronounced as the Berylliums.
The Berylliums lose out to the UF Hifi's in the overall separation of instruments. BUT they overall sound more cohesive when I look at them in this detail now as the important details are not missing at all if you listen out for them. Just that they are not as cleanly presented on a platter like the UF Hifi and easily picked out for 'consumption'.
I have to say, listening to classical tracks, the Berylliums actually sound better with energetic pieces. The tonal correctness seems to be there too just that the bass is overall more obvious but yet not quite bleeding or mushing up the mids either. It is however at the limits of what I like though.
But when it comes to pop tracks, there really isn't much of contest, the Berylliums sound better compared to the UF Hi-fi. From pop vocals to techno and rock. As long as it was an energetic track, the Berylliums came out better. On quieter, more delicate stuff, I actually like the UF Hifi better.
Looking at it, I'm suddenly intrigued by the UF Beryllium Hybrids !!!