Miguel, a couple of points: Not to sound like a scold, but there are posting rules on these forums that require the use of your full name as you "alias", which you can set in your profile. Second this a professional forum where people speak in complete sentences, with complete words.
The KF930 is not a sub. It is the low frequency component of a large multiway arrayed system, and is intended to operate in a higher frequency range than a sub. In the 900 series the sub is the KF940, which is also a dual 12" horn, a quite large dual 12" horn. The KF940 is intended to be used in blocks of 4, and has tremendous output and low frequency extension. The BH760 is a slightly smaller dual 12" horn loaded sub that has similar output to the KF940, but without as much low frequency extension. Even the BH760 probably goes almost an octave lower than you SL36's, with a lot more output. You should never buy anything at this level without an audition. EAW may be able to arrange something. At 30'x30"x45" and 253 pounds the BH760 is a little less than twice as big as you SL36's, and half again as heavy. On the other hand you may get enough sub bass out of fewer per side, so you may have a saving in size and weight. At a minimum you should have 2 per side, with more adding deeper bass as well as higher maximum output. The EAW subs want to see a lot of amplifier power. Each BH760 is 4 ohms (2x8 ohms) and wants to have an amp between 2500 and 3000 watts into 4 ohms.
You may also want to look at Sound Physics Labs Basstech 7
http://www.servodrive.com/Or Danley Sound labs Vortex and TH115
http://www.danleysoundlabs.com/products.htmlAlways try before you buy.
Mac