Playing a subwoofer below the tuned frequency and power handling will produce a very poor sound and will damage the subwoofer. The ported boxes can be much larger than sealed boxes. This setup has good power handling and excellent efficiency. The bass reflex or ported box is basically a sealed box with a port or vent tuned to a specific frequency. If you are going to be making your own sub box, the bass reflex boxes are not nearly as forgiving as the sealed box and you will hear you design mistakes. Isobaric is when you have a speaker mounted in a sealed box like normal but also mount another subwoofer to the first face to face. This setup requires less air space in the sealed box but takes two subwoofers to get the output as if you had the one subwoofer in the correct sealed box. Now even though sealed boxes require the least amount of space if you have even less space than need for you sealed box for a give subwoofer you can use the Isobaric setup. You may notice more distortion at high frequency and the speaker magnet will not cool as easily as non sealed boxes. The sealed box is the most forgiving to design errors. This seams to be one of the most popular subwoofer box used in SPL competition because it produces great low level power handling and require less space than most other speaker boxes need.
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