Interesting! Couple of questions I have:
Did your KSE cable break at some point?
Do you think the KSE driver is an electrostatic surrogate? Why?
Which other full range AMT IEMs did you try?
I really really like the AMT16
So I can comfortably say they are good IEMs (to me). Goldplanar explicitly talks about electrostatic drivers as one sound reference for their AMT IEM, that's why I thought of them being similar in some way
Thanks for your responses!
The cable was not broken. In any case, two of the two variants sold had no problems with the cable - except for its terrible ergonomics, but this is predictable. It had a bad effect on the possibility of portable use. I had the opportunity to buy a KSE1500 with the cable already replaced (it was the third one in a row), but there was a problem with the noise of WiFi, etc, picked up by the cable. The master who dealt with it said that this problem was eliminated in subsequent copies, but too much time has passed and now I have relatively lost interest in these headphones.
I do not consider KSE1200/1500 to be a surrogate for electrostatic drivers. I have seen their drivers to be sure that they are real electrostatic headphones. As well as Stax and some other rare companies.
I consider any non-electrostatic drivers to be surrogates of electrostats when their authors say something like we have achieved the sound of electrostatic drivers without these drivers. And preferably with prices several times lower. If that were true, electrostatic drivers would be extinct. But they still exist not only in the budget segment, but also in the top segment. After many similar words.
This means that I consider AMT in Goldplanar to be a surrogate for electrostatic drivers. Does this make them bad headphones? No, this is just my opinion, which does not claim to be anything.
I had the opportunity to try many variants of full-range AMT in IEM from a local master. There were really a lot of variants (more than 10) with different drivers, diaphragm thicknesses, folds, magnetic systems, and actual sound tuning. All of them were interesting in their own way, but none of them were actually electrostatic sound, if we use this term. I don't think I've heard everything that AMT is capable of, and nothing else can surprise me, and I can tell about is like AMT CEO.
When I received Ra with AMT driver at high frequencies, this model was able to impress me. And it didn't sound like any other full-range AMT I'd heard before. However, I am still skeptical that AMT can replicate the sound of electrostatic headphones.
At least because I don't think it's the right way to det it. There is no BA, dynamic, or electrostatic sound as such that is a reference that needs to be repeated and oriented towards. I believe that there are general quality criteria that are not something unattainable for any kind of transducer. For some, due to their specifics, some things are easier, for others - others. For example, electrostatic drivers are fast, but they often have problems with weight and bass response. DD are not as fast but good at playing at bass. However, this doesn't mean that all drivers of one types sound the same, and top-of-the-line solutions usually work well across the entire range. So in essence, they solve the same problem in different ways. And I think this is the right approach. If this hobby is aimed at achieving high-quality sound, and not at achieving the highest quality implementation of a certain type of driver.