You will need mini DSP.
The point I was making is that a sealed speaker only has the loudspeaker cone to actually interface with the air to produce sound waves. At low frequency, a loudspeaker cone is a terribly inefficient coupler to the air in the room, and has to be driven by brute force. Whereas pipes, and horns especially plus also tuned ports are much more efficient at coupling to the room. So the enclosure can be looked at as an acoustic transformer to interface the driver with the room at low frequencies.
So in a ported speaker at the bandwidth of the resonance the loudspeaker cone pretty much stops still and the vast majority of the sound is efficiently radiated from the port.
Similarly with a TL, at the closed end of the pipe where the speaker is the pressure is high and air displacement minimal. This occurs over a much larger bandwidth than a ported design. So there is a wide bandwidth were the cone movement is very low and radiation of sound is from the port. This couples very efficiently and pipes are able to cover the room in a very uniform fashion. This is what organ builders call the encircling property of pipes.
This is really notable as a massive difference between a true pipe organ and an electric one producing sound from speakers. The true pipe organ has a highly uniform loudness throughout the room. This is why it enhances singing and supports the congregation to sing lustily. An electric organ on the other hand is much louder close to the speakers and does not support congregational singing nearly as well as a well designed and built pipe organ. That is a property that makes the sound of my TLs in the room very different from other designs.
The most efficient way to couple a speaker to the room is a horn, where the pressure between driver and throat is enormous and sound output from the horn mouth loud. in compared to the output from the loudspeaker driver.
So the point is speaker designs other than sealed act as acoustic impedance transformers to drastically improve the match between driver and room. If it were not for the size advantage you would absolutely never entertain the idea of putting a loudspeaker in a closed box. You would reject it out of hand!
