Thanks for explaining the nature and design of the Foster/Fostex driver used in these headphones. My "overly simplistic, it's closed, closed, closed" is nothing more than a reflection of the information provided in the Massdrop description/spec sheet, which said nothing more than, "Type: Circumaural, closed-back." No mention at all of venting. Tyll's review on Innerfidelity describes the original Denon AH-DX000 series, in the "Foster variants" article in which the E-MU Teaks are reviewed, as "semi-sealed." But I did not take that to mean, as it was not clear, that it was a design element of the driver used in all the variants, as opposed to just the Denon line of headphones. Add to that, I am not sure the drivers used in the E-MU are exactly the same as those used in Denons, even if they are Fosters. And if one had not read that article, how would one know that the drivers are a foster 443742 and designed to be in a semi-sealed enclosure? So, in all honesty, considering the dearth of information about these cans, is it fair ,and not somewhat arrogant, for you to characterise my comments as "simplistic"?
If, as you imply, the venting takes place through the gap between the cup and the frame, does that mean that the ss can be changed by tightening or loosening the screws that holds the cup to the frame? The reason I ask is that the gap was bigger on one part of the left phone than the right, so I tightened the screw. But I now wonder, were measurements taken and was there an engineering decision made to determine what the optimal gap should be? For example, the Mr. Speakers Ether C line of headphones is vented but I think that much thought was put into the nature of that vent in terms of how Dan Clark wanted to tune those headphones. Again, there is no information about this provided, especially to those who want swap out the cups. What size gap should they leave?