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Hello, Ulf.

Interesting. The TAD1201H is 12-incher with resonant frequency of 50Hz.  It has relatively low resonant frequency for 100Hz Tractrix midbass but you most like used 10” thought and consequentially shorter horn. The shorter horns beam less. I tried the phase plugs in my 100Hz Tractrix midbass (4” throat, 8” driver, and 85Hz free air resonance). It defiantly extended unnecessary in my case HF, but I did not detect any changes in the beamnees...Probably the reason was because I was trying to kill HF in my horn as much as I could but you are trying to use HF. Well, it is all depends of what you want to get out of your horn…

In any case, your experiments with phase plugs for upperbass should be freakishly interesting for the flaks who try to push their horns high. The upperbasses have relatively large size and shape of the plugs, much different then we expect from the conventional plugs of the MF drivers. Do you have any pictures or sketches of your various plugs along with some measurable data? If you upload them then I will with great pleasure will map them to the site’s Knowledge Tree as it might be very educational. Particularly I will be queries to learn how the size and the shape of the phase’s “bulge” affect the frequency response.  When I made my experiments with upperbass plugs I was heavily (and perhaps mistakably) invested into the “water drop” shape.

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