Discussion in another thread has got me to wondering why virtually all the off the shelf click domes are manufactured round. I have never used these, as my KS8’s accept Rexton/Signia sleeves which are not round, but in fact quite oval shaped. I started with open sleeves, then closed sleeves, and now I have custom molds. When I measure these off the shelf sleeves they are approximately a 2:1 ratio shape instead of the 1:1 of a round fitting. I measured my molds which I presume reflect the actual shape of my ear canals and they are approximately 2:1 in ratio too. This would suggest the sleeves are a good fit for me. In fact so far the closed sleeves have worked as well as my custom molds, although I am hoping for better.
So back to my question. Why on earth do most manufacturers make round fittings? Is this a patent issue, and Rexton/Signia does not allow them to make them oval? Or are many ear canals actually round, and my 2:1 shape is odd? Just curious. It just seems to make sense to start with a fitting that approximates the shape of the ear canal in most people rather than trying to fit a round peg in a square hole.