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Thanks, LBJ

It is useful. I had also an idea to have a port mounted on removable plate in order to have the port side changed. I also, very much inclined for the yellow version, even my reasons are very none objective and I based my superstitions on the fact that a few commercial ported speakers that I do not hate had ports under the bottom (like older version of Edddelons).  Do you know what the depth of the port in the chassis responsible for?

I have a crazy ides but I do not know it I go for it. In yellow configuration I might have pipe with inner diameter of 1.25” welded from top port to bottom port. The pipe will be though the speaker, keeping the speaker sealed. The pipe will have spiral cuts. Inside this pipe I will have another pipe with outer diameter of 1.25” with similar spiral cuts. Now, turning on the coupling thread the inner pipe relative to the outer pipe I will have change the virtual port opening…  I am sure it will do the venting effect but I have no idea how the geometry of the initial escape of pressure affect sound. It very much possible that the profile of the port exist’s not the port’s entry is important and if it is the case then my idea will work and let me to fine tune the port by ears.

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