Hi first, so with a friend of mine the HT disassembled, was a MB Quart RCE 216, he actively connected it and chose the separation frequency probably too low, well, at least there is nothing more out. I want to ask now if someone has already had experience with the HT of Carpower, or who knows, as said he should actively to a Helix HXA 400. The other possibility would be to buy the HT at MBQuart directly, would be grateful for suggestions like always lg Flo