"Hi, I produce bass-oriented dance music and am looking for build a sub that can decently represent bass down to ~10Hz in a fairly long room (2 or three small rooms in a row)... I understand this will have to be relatively powerful, but I am not very well versed in subs..."
dance music is only good loud. :-)
big rooms like that have minimal room gain, so it is going to have to be mostly speaker.
low frequencies are more difficult to sense than high frequencies. this is shown in the equal loudness contour here:
here is the response of two 18" driver configurations using the b&c 18ps76 (the kind of driver you might find in a decent p.a. cab).
one is 6 cubic feet tuned to 38hz. the other is 12 cubic feet tuned to 10hz.
now that is for 1 cab each. every time that you double cabs (and power), you get about +6db. so with the higher tuned cab, two cabs will give about 128db from about 38hz up. that is what you are used to hearing.
the other thing would require about 32 cabs to get the same spl level all the way down to 10hz. if that seems ridiculous, it is, which is of course why nobody tunes cabs that low for dance. a much better plan would be to tune the cabs for about 27hz or so. at least that way you have a shot at filling the largish room with dance level music.