can somboady tell me how subwoofers make pressure to suck in and out though the turbo port and stuff thankx.?

Answer 1

turbo port what? are you asking how a subwoofer pushes air?

Answer 2

Well, this is quite the question for which a very long and complicated answer is warranted.

How "subwoofers make pressure to suck in and out though the turbo port" is simply the movement of the sub when a signal is applied.

Since air pressure isn't static but rather linear, the time interval from the bottom position to the top position of the subs cone creates a slight vacuum. As the air pressure from this vacuum is trying to equalize in the enclosure, the subs cone begins to move in the opposite direction. Once the cone has reached the bottom position, the air pressure once again tries to equalize.

This whole process creates a slight lag between the actual movement of the cone and the air pressure. This movement of air through the port is a direct result of the moving air pressure from behind the cone. The front of the cone already produces air pressure of it's own.

This is why ported enclosures perceive to be louder than sealed enclosures. A sealed enclosure has only one source for air movement whereas a ported enclosure has two.

This is after all how sound is produced, the movement of air.

The most important factor in porting is the internal enclosure volume and tuning frequency in relation to the port diameter and length. Here's how to calculate this.

Port tube length calculations:

Input = Radius of Port (R), tuning frequency in Hz (fb), Volume of the box in cubic inches (Vb), (L) will be the resulting length of tube.

L = (1.463 X 10^7 X R^2 / (fb^2) X Vb) - 1.463 X R

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