Rane AC22 Active Crossover.
2 way - stereo; 3 way - mono.
Data sheet (http://www.rane.com/pdf/old/ac22dat.pdf)
Manual (http://www.rane.com/pdf/old/ac22man.pdf)
(http://alembicguitars.net/club/messages/395/36286.jpg)
(http://alembicguitars.net/club/messages/395/36287.jpg)