So I read the thread about the "vertical 410" and thought that's just what I need. I was thinking of building a fEARful but it would have been too expensive since I'd need two of them (two bands, different rehearsal rooms). Having two 210's would give me the maximum portability AND versatility. Plus I assume it would be cheaper than the fEARful drivers, and definitely easier to build, not to mention I can build just one now and when I need/can build another one. So I come here asking for your advice. Are there any proven good designs for 210's? Have you built your own and want to share measurements? Any recommended drivers? Thanks!