So recently I was thinking about the Geek Wold GK10, how I had a good experience with it (no QC issues, and since my headphone amps are all very low ohm on the output side, the 8 Ohm output impedance wasn't an issue for me), and I was browsing Crinacle's graph database, looked at his GK10 graph and was reminded of a couple of other graphs - the iBasso IT01S and the WG T-One. Now both of those are single dynamic driver IEMs and are in a different price bracket entirely, but I also remembered how they were received in their respective times. The iBasso IT01S came out in late 2018 at $200 (currently being sold for $100 by "ProStudio Sound & Music" on Amazon, still selling for $200 at Penon), sporting a Diamond-Like Coating on a Carbon Nanotube diaphragm of an unknown size, 1 Tesla magnetic flux, 16 Ohms of impedance, housed in an electroplated plastic shell. Reviews in the beginning were very positive (lots of comments of how balanced and natural they sounded), with a small number of negative ones coming in late in 2019 complaining about price and not being outstanding in any way. I believe it was in 2020 when the WG T-One was introduced at $100, with it's single 10.2mm dynamic driver utilizing "double-layer composite membrane material" (so undisclosed materials), Tesla magnetic flux, 36 Ohms of impedance, housed in an all-metal shell with tuned dual cavity. Not as many reviews of the WG T-One came out, but I found the frequency response graph compared to the iBasso IT01S interesting:
I've never seen anyone compare the two. The one review here at head-fi on the WG T-One has a single con in the summary: "Too safe in highly competitive market". Now let's see how the Geek Wold GK10 stacks up to the iBasso IT01S:
They could be cousins, if not siblings in terms of their general frequency response character. Geek Wold GK10 came out for $48 in 2021, 7mm (I've also seen 8mm claimed) titanium alloy and multi-layer composite diaphragm + 1 balanced armature + 2 piezoelectric ceramic drivers at 8 Ohms impedance, housed in a plastic shell with a bit of stabilized wood. Obviously the GK10 is going to behave differently with multiple drivers at only 8 Ohms and a much lower price point (i.e. amp sensitivity, some absolute performance limitations, and potential QC issues). Sub-bass takes a bit of a dip where it remains more flat in the IT01S. And I think we can see where the GK10 BA and piezo drivers are elevating the upper treble. Overall I wonder if this frequency response (even with some extra help from BA/piezo drivers) is just considered "too safe" to generate wide-spread excitement, which seems to be what happened to the WG T-One. It will be interesting to see where Geek Wold goes next.