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As an ENT physician and audiophile, I have to say ADEL at heart is a modified vent. I think if you were to graph the effect of the different modules on a graph, it will dampen certain frequencies to different degree. To understand vent in a traditional hearing aid read this article http://www.hearingreview.com/2006/02/fitting-tips-how-do-vents-affect-hearing-aid-performance/. Look at Figure 2. When you create a vent hole or any dampening affect on the IEM side, it always drops the low frequency first. The larger the hole the more you dampen the low freq, the more compliant the diaphragm is as in the ADEL modules, the more you dampen the low freq. The physics and anatomy are such that you cannot electively dampen the high frequency first. The whole thing with more soundstaging and 3D imaging is just marketing. I wish sometimes manufacturers can be more transparent about this. If you ever get a custom sleeve made for IEM and ask them to leave a large vent hole on the custom sleeve, you can get different size plugs for the vent hole. By dampening the low-frequency, it will create the sense of more wide open sound stage. I have had 2 made by Westone for IE80 and XBA-Z5.
I still think what 1964 Ears is doing is an excellent idea. Other manufacturers should have done this a long time ago, but it's not some novel, revolutionary technology. It's a good adaptation of a long existing understanding of how the ear canal transfers sound. Whether it's worth the extra $ it's all up to the end users. The A12 is on my list as one of the next CIEM choices.
Just want to chime in with a few comments. First of all, looking forward to your impression when you get A12 and spend some time with it. I absolutely agree, there are articles and measurements, but certain things are better to be experienced with our own ears to draw the final conclusion
Regarding "extra $", that is a beauty of A-/U-series monitors from 64 Audio. They are priced very competitively, and with periodic 10%-15% discounts can be even cheaper than some other multi-BA iems/ciems competition. So in reality, they are not exactly capitalizing on "ADEL" by charging extra money for it, but rather charging as much as other brands and using ADEL technology to attract new customers to discover 64 Audio. As I mentioned in my U12/A12 review, 64 Audio (1964 Ears) existed before ADEL tech and were already an established name with a fanbase. IMHO, it's not about ADEL making these monitors sound better, the sound credit goes to 64 audio design and tuning, but rather making listening experience more enjoyable and safer for extended use. And in reality you don't really have to pay extra for it.