Ive been thinking of getting the BFD pro to use as an e.q. for my sonosubs. Looking at the back panel on the website it appears to have XLR connectors. How do I plug the RCA sub out of my receiver into this unit, and how do I connect the unit to the power amp (probably a QSC or Yammie xs350). Does the BFD have a subsonic filter built in or should I go for an amp that has one? I have two identical subs(shiva) located side by side, I am assuming one BFD would be all I need to e.q. both subs? I have looked at the Yammie website and it lists their power amps as having 'barrier-strip' connectors-what are these? Harry.