By all means checkout Linkwitz Labs! Easy to build, unconventional looks, superb sound. I have built the Plutos, LXminis, and the LX521-4 (open baffel). No better sound for the $$. You can use other subwoofer sections with the LX521s as the "real ones" are pricy. Madisound has kits with packaged electronic crossovers. Contact me for more info if you like.
