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AV Sound Lab said:
The simplest way to understand port resonance would be to think of a pipe organ. Pipe organs use a series of pipes that have different lengths and diameters to create sound. Each pipe is used to create a different frequency; a port in a loudspeaker or subwoofer can work in a similar fashion if its resonances are excited. While this sound is pleasing in a pipe organ performance, resonances of this sort have been shown to decrease listener preference, if audible [1, 2]. So, the first question that must be asked is what exactly causes these resonances? The next step is to analyze the situation such that these resonances can be properly dealt with rendered completely inaudible...

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