Sealed cabinets are much easier to design and build than ported enclosures and are typically smaller in size. It helps to create a better control on the diaphragm leading to more accurate sound.Ī sealed cabinet produces a deep base and more accurate sound. When the speaker moves out, the pressure inside decreases, when the speaker moves in, the pressure inside increases. The air inside the enclosure acts as a spring, which helps control the movement of the cone. The back of the speaker is completely sealed off. Three major types of speaker enclosures are sealed, ported and bass-pass type. Shaping the low-end (bass frequencies below 200Hz) is the reason for choosing a particular enclosure type.
Any speaker will produce sound in any cabinet, but optimizing the relationship between the speaker and the enclosure is the key to good bass.
The speaker enclosure (typically, a box) is critical. Additionally, because they would travel different paths through the listening space, the sound waves would arrive at the listener's position at slightly different times introducing echo and reverberation effects not part of the original sound. The primary role of the enclosure (typically, a box) is to prevent sound waves generated by the rearward-facing surface of the cone (diaphragm) of an open driver interacting with sound waves generated at the front of the driver because the forward- and rearward-generated sounds are out of phase with each other, any interaction between the two in the listening space creates a distortion of the original signal as it was intended to be reproduced. You would have noticed how most speakers are built into wooden cases? That's not just to make them look nice: it drastically changes the sound. You can dramatically alter the quality of the sound your speakers make by putting them in different places. These reflected waves bounce off the walls, floors, and furniture in your room and interact in many different ways, sometimes adding together and sometimes canceling out. These sound waves get generated from both directions of the cone.
Due to this rapid movement of cone the sound waves are generated. If you see a speaker cone (diaphragm) when it is turned on, you can notice the cone moving up and down very quickly. Sound is invisible most of the time, but sometimes you can actually see it.
When things shake or vibrate, they make sounds we can hear in the world around us.
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