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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.