Some months ago I made box for ONE (1) Type R subwoofer.
I made this box:
Net Volume: 3cu.ft
Tuning Freq: 30Hz
Port Width: 3.25 inch
Port Area: 40.625 square inch
Port Length: 35.25 inch
Now I want to put TWO (2) Type R subwoofers to same box.
So how can I calculate what will be tuning freq with two Type R's in this box?
Port width, area, length will be same.
It would be great if you could explain how to calculate that tuning freq