Just took receipt of my BK sub and to say that the instructions are rudimentary would be an understatement. tried to ring them but they are on their hols until the 19th so I would appreciarte some advce . first of all its the connection bit . I have a high level input which I am being told to connect amplifier output - I presume this must mean that the amps own power output wopuld be used and the sub would be passive. Then there is a low level connector which consists of a pair of rca jacks. unfortunatel the back of my amp only sports ONE jack for sub connection and I am assuming this must be for coax cable. Does this mean I need an adaptor of sorts? There are also four knobs- high and low level gain ,freq. and phase for which instructions give a very short description and thts it . They obviously expect users to know exactly how these things work already and not be a complete numbskull novice like me Please help!