Hi!
Thank you @witwald for point out. I forgot to change the k factor.
I apologize @Onslo.
Since WinISD doesn't calculate it, I've applied the k=2.227 supposing the slot port would be like the one in the figure.
This way, the new tuning frequency would be 24,22 using the Lv formula.
With slot ports there might be other corrections such as the ratio of wide/height, right?
Maybe using a circular port is better, cause you can make adjusts by just changing the length of pipe.
Just plan the diameter correctly according to the length needed.
A 6" will require 47cm length for 28Hz tuning.
Maybe a 5" will get you more room to adjust since it requires only 30cm for tuning at 28Hz.
And if the enclosure is ready, with the slot port, you can first try to use 24Hz tuning - see below the simulation.
Still good FR
Do the calculations below make sense?
The 0.732 matches WinISD simulation - I supposed a circular port of 16cm to have the same area of 200cm2 in order to use the Lv formula.
If using 24Hz, you still have a good FR - 28Hz crossing at -3dB and a bit smooth roll off slope.
