tyger-- i acquired a pair of sf-10s about 7-8 years ago, and posted a good bit about them here on AK. mine did not have the controller and i did not like the sound without it at all, even though i tried to eq it. i launched an internet search blitz and eventually came up with a guy who had the correct controller, and it significantly improved things. i next discovered that the surrounds on the woofers were on their last legs, but again somehow discovered that an inexpensive Pioneer branded 10" woof available at Parts Express was the exact replacement. mind you, i'm working from a number of years worth of memory, so....
the x-overs are extremely complex, as it is a three way design with two woofs in each cab, and if memory serves, 4 tweeters in the domes. plus all the business with the eq and ....well, you'll see. somehow, i was relentless about experiencing these speakers as they were intended. there was quite a bit of good review about them back in the day, and i was convinced that i had something really cool, which, in a way, i did.
next i mounted them up on heavy casters so they could be rolled in and out of position and also nullify vibrations into the floor. i was struck by the presentation of the deep, centered soundstage from any seating position, but i could never get happy with the following: boomy bass, shouty midrange, and shrill tweeters. perhaps if i'd recapped...? but by that point i was a year and a good bit of effort and $$ into them and i just stopped loving them.
sold to a guy in california who joined AK after seeing my posts about them and sent me a PM asking if i'd sell, which i happily did for several hundo's
have fun, and put a big strong amp on them