i started out with a bass horn down to about 50 hz, i wanted to refine the klipsch idea, using the corner of a room. but instead of using only two dimensions (as in parallel to the floor), i wanted to use all three.
there are some pics at
http://www.uni-weimar.de/~knapp/dashorn.html

for mid i used some really old 3,75 ohm 10" drivers i got from a friend: some french brand called "bouyer". i packed 4, later 6 of them in a "it's all right it will work out fine" enclosure, and it did.

for treble i got 2 monacor ht-958pa/si per channel.

when successfully infected with the horn virus, i built two bass horns, to have true stereo. those were designed to go as low as 35 hz, real big, and nicknamed "bathtubs" by my flatmates.
you can check on
http://www.uni-weimar.de/~knapp/diehoerner.html

this system was very fine, especially for live rock'n'roll recordings, which i like very much. now i finally could listen to my favourite music at concert level at home. 8))

later on, another friend gave me a pair of huge fiberglass diy mid horns, driven by n nondescript 12" chassis. they were huge, about 1 m long and 0,8 m in diameter, but in a bad condition.
along with those, i got the gauss drivers and fitting horns.
that was when i decided to switch to "horn only" mode.

all i need now are some decent tweeters...i want to get rid of the monacor stuff, which is not really crappy, but just not as cool as it could be. i'm thinking about getting a pair of gauss 1502s...well, it's christmas soon.

guess that's about it. story of my (acoustic) life.

out of my curiosity: i have to admit i never measured something ever...i always thought the equipment was cruelly expensive - or is there something cheap right now i could e.g. hook up to my computer? any recommendations?