The speaker enclosures are calculated based on the T / S parameters, using a calculation program; These programs include WinISD, Unibox, BassBox, Leap, etc.

Data to be followed for simulations:

To have the desired F3 frequency, depending on the application: for subwoofers an F3 frequency as low as 40 Hz, 35 Hz is ideal. For fullrange is enough a speaker with an F3 around the frequency of 50-60 Hz for satellite, the crossover point is very important, the frequency F3 being between 80 and 150 Hz, I recommend to be below 100 Hz for optimum results, ideally it should be as low as possible, but to respect the satellite dimensions and the following aspects : to have the group delay smaller, at a frequency x, than 400 / x (x being the frequency at which the group delay is read); the speed through the ports should not exceed 25 m / s in the frequency range in which you will use the acoustic enclosure, because if the speed is exceeded, the sound produced by the air circulation through the ports will become audible and this is not desirable, the recommendation it would be useful to use ports of the largest size (preferably 8-10 cm in diameter), but be careful, the larger the diameter, and the port will be longer; you must also consider the movement of the membrane, it is recommended that it should travel as small as possible, not to exceed Xmax, but this is not possible all the time, and then we must consider the following thing: the more enclosure it is so much more moving and memebranged, so do not try who knows what size enclosures like the fridge. Another thing that can cause the membrane to have a large stroke is to give it a too-low speaker, so do not give a speaker above the loudspeaker's resonant frequency, as you risk breaking the speaker (this is for bassreflex speakers).