Caraudio Subwoofer with bass reflex design has been around for years with names like Hemholtz Resonator Resonator and Kentucky. The design serves the same purpose as the firm closed: to isolate the wavefront of the wave back. The difference is in port: The port uses and manipulates the rear wave, resulting in more low-end extension to the SPL octave or more in the region of the lower mid-bass. We can build a Caraudio Subwoofer with bass reflex system to extend the low end of the Caraudio Subwoofer or to improve the woofer SPL capabilities.
Main moved to the back of the case is similar to blow the top of a bottle of coke, and hear him whistling softly.
The tone is produced when the air masses that are suspended in the neck and body of the bottle is attached to the resonance.
In moving the Caraudio speaker, a certain frequency, the woofer to put a tube of air masses and the box of a common resonance. When you place the port box "tune" a box for a particular resonant frequency. Port air mass vibrates at the same pace cones cones, damping the movement. Cone, the driver almost immobile, and the sound comes mostly from the port.
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