I got to talk to Dan, and look at some of the internal parts. The tolerance he is building to, and holding his vendors to are on the order of aerospace and high rpm Turbomachinery (I've worked in both industries fwiw). This level of tolerance should provide a high level of consistency unit to unit. It should also provide the ability to make small changes to affect sound signature. I guess this doesn't really answer the op, but it is on topic with the original question.