Without the enclosure, even the best speaker would sound thin and reedy. The main job of the speaker enclosure is to prevent this type of sound cancellation. It must keep the sound radiation from the front of the cone from colliding in midair with the sound radiation from the rear of the cone.

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A good rule of thumb is to add at least 2 to 3 inches to the size of the subwoofer. For example, a 10-inch sub should have a front panel at least 12 to 13 inches square. Size the depth of the box to create the volume you require for your box.

A speaker in a good designed box will reproduce better (louder) bass. When you have a speaker in a box, you will not lose the midrange. You will just gain more bass, and therefore it may drown out some midrange, but it is stll there none-the-less.

Yes, it will sound much better with a properly designed box, and with a properly designed crossover that divides the frequency spectrum to each respective driver. These are non-negotiable if you want good sound, and protect the drivers from damage.

So do in-ceiling speakers need a backbox? Yes. Failure to install a back box for your in-ceiling speakers will dilute the sound quality and lead to noise pollution in other areas of your home.

Because there is so little space in a car the bass notes (which are long pressure waves) build up inside the passenger area. Once this magic frequency is reached, bass output will increase by about 12 dB/octave below that frequency. This phenomenon is called cabin gain or the “transfer function”.

A fourth order enclosure (vented box) is a sealed enclosure with the additon of a port tuned to a specific frequency. The port extends the low frequency response of the basic sealed enclosure usually providing a lower cut-off frequency.