Some time ago I found examples for bass reflex port tubing with holes (this is a german article but for reference: the first measurement compares the perforated and none perforated bass reflex tube) and for speakers using flexible material for the tubing (page 16-17), both to reduce overtones in the bass reflex tube. While both approaches are understandable in their concept I am missing further details to fully comprehend them. For instance in the german article it is pointed out that the length of the tube has to be longer by 2^0.5 when adding those holes. Wanting to dive deeper into the topic I tried to find some more articles and measurements. However, my search was unsuccessful.
I was hoping if someone of you could point me in the right direction. Is there no more research available or do I simply dont know the correct terms to search for?
I was hoping if someone of you could point me in the right direction. Is there no more research available or do I simply dont know the correct terms to search for?
The flexible port of the KEF LS50 with its middle part stuffed with closed-cell foam has it's action described on page 17 of your link.
For more information, Google 'damped or lossy bass reflex ports'. e.g. Damped (lossy) BR ports
For more information, Google 'damped or lossy bass reflex ports'. e.g. Damped (lossy) BR ports
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