So I took the plunge and ordered my 18+ CSX. This weekend I will have the fikit ready to go, and will enter the desperate waiting stage for the arrival of a pair of IEM's that cost more than my entire first Stereo system. I have for years dabbled, beginning with Etymotic (ER4 maybe?) ones the wires broke on, replacing them with some Shure SE5 somethings, and then UE Triple Fi's that I really liked. Over all of those the thing I tended to hate was always around the fit, not so much the sound. I tried umpteen versions of tips on my Triple-Fi's, but eventually decided the best thing was Custom...and if I was going custom I was going to go all in, so the UE 18+ CSX.
Before my question I'll describe a bit about what I like, in case the context matters. What I love about good (in my experience so far) IEM's is the ability to sort of "lose myself" in the music. I love the little bits like finally hearing the sound of a pick against the string, or the sound of a singer taking a breath. Being able to focus on the instruments individually, and as well as the whole. I fully admit (despite reading the super helpful stuff on this forum already) I suck at my ability to actually describe stuff like warmth or sparkles or other stuff. I listen to a wide range of music (Celtic folk, Harp, NWA-era Rap, Folk, Americana, Rock, Metal, Alternative and even classical are all on my playlists). I do travel a lot, so whatever my choice is needs to be portable. The same rig needs to work on an airplane as it does for my hotel or even working in my home office. My music is in 3 categories. I ripped my whole CD library to FLAC some years ago. I have some basic fidelity MP3/iTunes downloads, and I am slowly converting those (and my new purchases) to HD sourced tracks as I get the urge. I am not big on streaming, although I'll stick Spotify on a rental car bluetooth link sometimes, but that is sort of irrelevant to my "active listening mode" that I want the CIEM's for.
Right now I have two options on my planned source. Straight out of my Galaxy S9, or through my Oppo HA-SE2 assuming I can get the stupid OTG cable to finally work with my S9 like it used to work on my S7. So yea, I am nowhere near the league of some of you guys in setup. So here is the question...how big a deal will the DAC really be? I know at 105db sensitivity, the actual amp function of my Oppo is not really critical, although just getting it into a slightly cleaner power source than the phone I will assume is some benefit. Now I know that the Oppo is not exactly in the high end DAC league (or even mid range tbh), and maybe isn't really that big an upgrade over a Snapdragon S9 even. I will plan to do the basic things. Enjoy my new cans, try them with and without the Oppo, even try out the Bluetooth (although I find it weird they don't even try and support a better Codec than SBC).
For next steps though. Do I look at a DAC only, skipping an amp stage? If I am going for an upgrade ANYWAY, does going to a DAP make sense given the ease of portability of not trying to fit a rubber band around my DAC/Phone? Am I really wasting the potential of these phones plugging them into basic components, or is the whole DAC/DAP thing in that hard to qualify "slight incremental improvement" step?