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Ive seen this soooo many time before, and just flat out said- Transmission line

Then I double checked since it was labeled a dual tapered waveguide

Exit, and entrance is equally the same area, and it pinches in the middle, not a huge amount, but enough to increase vent velocity

Ive built a box like this once for 1- 8" and its Q is tuned based on the pinch in the middle

tighter pinch, more narrow bandwidth, more even with entrance and exit, the flatter- lower Q it gets

sundown.jpg
I have a ritual called "terminator". I crouch in the shower in the "naked terminator" pose. With eyes closed I crouch for a minute and visualize either Arnie or the guy from the 2nd movie. I then start to hum the T2 theme. Slowly I rise to a standing position and open my eyes. It helps me get through my day. The only problem is if the shower curtain sticks to my terminator leg. It sorta ruins the fantasy.
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