Dual Ported Subwoofers

Like all ports on speakers subwoofers use ports to help "tune" the frequency range. Read this article to see how ports affect speaker sound. In some subwoofers two ports are used. This could be used to correct a drop in a certain frequency range in a driver or enhance the low end of the frequency range without using a larger driver. Adding two ports to a subwoofer gives the designer greater flexibility in "tweaking" the sound of the sub. This can sometimes help a smaller but "musical" sub achieve lower frequencies without a bulky cabinet. The Speaker Company just released it's ASW-10 10" 100 watt sub with dual ports for a pretty decent $149.97. Anyone else see any dual ported subs out there of note?