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-   -   Port length for microTower (https://www.diyaudio.com/forums/full-range/373815-port-length-microtower.html)

DoktaDave 22nd June 2021 09:19 AM

Port length for microTower
 
Hi
I'm almost certain this is a dumb question, but I can't work out what I'm doing wrong. I'm currently building a pair of the Microtowers from the frugal-phile website using the Pluvia 7HD. The port for this is specified as 3 inches diameter by 4 inches length. The pipe I have for this is 80mm internal diameter. It seems unlikely that that would make much of a difference, but to check, I've tried to re-calculate the port-length using the equation Lv=(23562.5*Dv^2*Np/(Fb^2*Vb))-(k*Dv) (as recommended in the plans). When I do it though, it tells me the port should be over a metre long. Where am I going wrong?

bansuri 22nd June 2021 10:18 AM

I think that guy mixed up inches with centimetres.

Scottmoose 22nd June 2021 11:00 AM

For an 80mm duct diameter, increase length to 108mm assuming a regular untapered type.

GM 22nd June 2021 05:11 PM

FYI/FWIW: Scaling vents: FE126E enclosure question

DoktaDave 22nd June 2021 06:28 PM

Thank you. This is exactly what I needed :)

GM 23rd June 2021 03:53 AM

:up: :D


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