THE DIY SUBWOOFER NETWORK

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

There seems to be a lot of confusion about how to design and build a subwoofer enclosure with multiple subwoofers in the same airspace.  This blog post is going to clear it up. A Single Subwoofer in one enclosure Let's start off with something simple, a single subwoofer in a 2 cubic foot enclosure tuned to 28 hertz.  In this example the port has been drawn outside of the enclosure for easier comparison.  The port is 1"X12" and is 17 3/4" in length.  Before you go out an build this enclosure keep in mind that a 1"X12" port is probably not large enough to prevent port noise.  This size was chosen just as an illustration.           If you wish to add a second subwoofer then you will need to increase the size of the enclosure.  If you increase the size of the enclosure you will need to make a shorter port.  This is because you tune the port to the airspace in the box, not the number of subwoofers in the enclosure.  So here is a 4 cubic foot enclosure with a c