I'm pretty sure that Aperion speakers use Diarual crossover that use simple resistors and take up less space than normal crossovers. I think the technology is related to Kimber Kable in some way. Aperion also uses Vifa drivers and are supposedly quite good speakers. ........my memory seems to be lacking.
Aperion used to be called Edge Audio, who are usually compared with companies like Ascend Audio and Home Theater Direct.
Check out http://www.aperionaudio.com.
Joe