Multiple Woofer Enclosures
If you are building enclosures for more than one woofer, they should always be divided to maintain the correct airspace for each woofer. There are a couple of reasons for this. First of all, not all woofers are exactly the same. If there are slight differences between the woofers in a common enclosure, at certain fre- quencies one woofer may think it's in a larger enclosure than intended. This can affect the power handling capability. Second, if one woofer fails, the remaining woofers will have more airspace to work in than what was designed. Again, this will severely affect the power handling capability of the woofers that are still working.
Another benefit of a divided enclosure is that the divider helps strengthen the enclosure. A large common enclosure will have much bigger panels than one that is divided. Large panels tend to flex more and can cancel some of the woofer's output.
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