Thanks everyone. Highly appreciated, all contributions to this topic.
A bit off topic.
Having made an effort to improve all my IEMs via tip rolling, I come to a life changing conclusion. I am abandoning the budget category of IEMs, the more revealing I hear them, the more I face the truth, they cannot compete. I have at this time the following budget IEMs. CCA Polaris, CCA CRA, KZ EDC Pro, 7Hz Zero 2, but as soon as I hear the ARTTI T10, no contest, a totally much better result. Far more accurate. I've been listening for months, and I do not know if driver break in(burn in), is true or not, or if it's my own ears that needed to be broken in(burnt in). The conclusion, is final. No more budget IEMs. It's like a budget car, they simply do not have the kind of acceleration, you get in a more powerful engine.
We live only once, why subject ourselves to mediocre sound.
I've been hearing the difference for months, but yesterday it came to a head. I was listening to some gospel music - More than Anything, Lamar Campbell and others. We are familiar with how voices should sound, and for this kind of music, they are careful, NOT to distort the vocals, through tons of "compression" or other dynamics processing. Furthermore there is a complexity, hearing lots of voices at the same time.
I am reminded of the ethos behind the Harbeth (BBC inspired) Hi-Fi/Studio speakers, which was natural reproduction of the human voice. It was so apparent like chalk and cheese, huge difference - the budget IEMs, mangled the vocals, making them sound like aliens, the ARRTI T10 - just lifelike, the most natural. That was my conclusion. like mirror mirror on the wall, only one of these IEMs was telling me the truth, and that was the ARRTI T10.
Why the hesitation, why did it take me so long to - fully accept this, self doubt. Also I've listened to dynamics headphones or earbuds and now IEMs, all my life, that is what I know, so hearing something else seemed strange, and "wrong". But it's now conclusive, no more budget single DD IEMs. I will still keep them for nostalgia purposes, or as backups. Or as a way to reference what listeners with budget devices, will hear, of the music/audio, which I work on in my studio. But for my critical or pleasurable personal listening, no more budget IEMs. Not worth the economy or savings. You just keep buying more and more of the cheapies, but the solution is to stop and spend the money on something that is truly excellent like the T10.
The biggest challenge is, there are no clearly articulated measurements that I know of, that will tell anyone that the T10 sounds better than these cheapies. None. So as much as this web site AudioScienceReview, makes some effort - apologies, it is a bit of a waste of time. Those measurements reveal nothing about exactly how a headphone or IEM will sound. I say this with all due respect, not out of disregard, but we are not yet there. My hunch is maybe there is information available in the group delay and impulse response measurements, but these are not consistently published here in IEM reviews. Also maybe there is information in the Waterfalls. So the only real way we can anticipate how a headphone device will sound, is to take the word of reviewers. Especially where there is consensus.
But herein lies the dilemma - there is also consensus, that the 7Hz Zero is a good sounding device, and I agree, but only in context of similar budget devices, not a giant killer, but it's hard in the plethora of favourable opinions, to appreciate the context, of the positive views - good - for the price. I think price should no longer be a consideration, simply compare products based only on quality, and let the buyer determine how much they are willing to spend, not the other way round where we pigeon hole products into price segments. If the audio quality is the priority, forget about price, rank devices based on perceived quality, and the only way we have today of doing this really is subjective. The Zero 2 and the ARTTI T10 have somewhat similar Frequency Responses, but nothing I know at this point in time, explains the huge difference in sonic accuracy. At least nothing in the Frequency Responses.