Unfortunately, the store does not allow returns on IEMs due to reasons associated with hygiene. Judging by your name, I'm pretty sure we're from the same country, so you know how hard it is to purchase audio products here, since we barely have any proper showrooms.
The reason I wanted to upgrade to the HEM8s is that I wanted something like HEM2s, but better. They were my first foray in BA IEM territory and I like their analytical sound and tight bass.
The Massdrop sounds good in theory, but when I factor in shipping and VAT, I think I'll be paying the same amount of money, but with worse warranty support
. The 300 euro deal includes taxes and a standard 2 year warranty.
I went yesterday to the store in question, with the intention of testing the new Sennheiser Momentum true wireless and maybe the HEM8. They did not have the HEM8 on display unfortunately, but I had the opportunity to test some other wired IEMs: the Sennheiser IE800S, the Fiio FA7 and and the Fiio FH5. 10 minutes each, connected to my phone on Tidal, so not exactly scientific, but very close to my use case. I'll number my impressions so that they'll be easier to read and maybe provide you guys with the information that you need so that you can give me some advice:
1) I could tell straight away that I wouldn't enjoy the MTW, even though they're just as detailed, or maybe even better in some areas than my HEM2. Their muddy bass ruins most of the electronic music that I listen to. It's amazing to see what Senn has done in a completely wireless form factor though.
2) I could also tell that the wired IEMs could not reach their full potential, at least not when connected to my phone.
3) Of all 3 IEMs, I enjoyed the signature of the 4BA Fiio FA7 the most, even though the IE800S had the best overall SQ.
4) I also liked the rugged Fiio cables a lot.
Some other info that may be useful:
5) I listen to almost all genres of music on my commute, mostly through tidal, so it's hard for me to pick a sound signature.
6) A little ruggedness and an easily replaceable cable are things that I need to take into account when purchasing my next IEM.
As a side-note, since we're talking about phones: The XZ3, like most other android flagships (with the notable exception being the V30), have the same DAC/Amp setup, so the sound is similar between all of them. And it's more than decent. However, Sony's post-processing (DSEE HX) really does make quite a difference for lossy playback. I don't know if it is objectively better than the pure output from the phone, but to my ears it doesn't sound like just an EQ. I know Sony phones aren't exactly popular these days, but if you need a phone with good audio for IEMs, their higher-end XZ series are a great match. Too bad they gave up on the headphone jack.