Despite what I told Jason, they do sound decent, considering how easy they are to make
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I'm assuming they are surrounds?
If those drivers won't produce enough output, then most any kit should be rebuildable into a box more to your liking. On the cheap side of things, a TB 4" will produce a lot more output at the expense of rageedy top. For a "proper" design you could look at Rick Craig's SL-2... (? is that what it's called) and use different box dimensions. If you're leaving it ported, keep the same internal volume; if you're sealing it, you can make it a fair bit smaller. Unibox will reveal all.
HTH
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