What is a Bandpass Subwoofer?
What exactly is a Bandpass Subwoofer? Let’s take a look and see! Along the way we will dispel some popular myths about bandpass subwoofers. Forth Order Bandpass Subwoofer Enclosure The image above shows a speaker enclosure with the subwoofer mounted on an internal baffle that divides the box into two separate airspaces. One of those chambers is sealed, one is ported. At first glance this seems like an odd configuration. How does it make any sound if the speaker is inside of the box? The answer is simple once you understand that a port is just a speaker made out of air. As the air in the ported side of the enclosure is compressed and decompressed it causes the air in the port to move back and forth and the port produces the sound. A common myth is that the subwoofer driver makes the sound and the port “let’s the sound out”. That is not accurate, what you are actually hearing is the sound waves produced by the port itself. DIY 4th Order It turns out that there