I trying to keep my posts that pertain to Alpha Prime here instead of spreading around in various threads.
I also did hear the TH500RP at RMAF Dan can do better.
What is amazing to me is that Dan does not have all the resources of a big corporation in developing a product. Dan has the advantage that he answers to no one. That allows him to have a single focus on what the next headphone should sound like and to succeed with far less resources. It does takes a bit of experimenting to find out what tweaks or changes in materials that will give a better quality of sound. That is something a computer program will not have all the answers. In the end it takes an artist to create a wonderful sounding headphone. More to come.