Alpair 7 MS experiences so far anyone?

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Guessing the radius of the roundover (at 12mm) i estimated a tuning of 53 Hz. I prefer a curve with only 1 inflection point (60 Hz) and then if needed i knock it down with a purposely high resistive vent (as on your Mar-Kens).

I estimate shortening it to about 80mm overall. A round port can be made more resistive using ganged soda straws (ala mission) or circles of open cel foam (stack them for more R)

dave
 
oops, forgot to post the accompanying graph

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dave
 

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