You will need to connect the FBQ between the receiver LFE output and subwoofer.Do I just hook up one channel on the bfd comming from the lfe on my rec
One channel of the FBQ is used. Start off with the FBQ in BYPASS mode to ensure it's all hooked up right, and so the filters are disengaged.
The cables between the receiver and FBQ and also between FBQ and sub will be RCA to 1/4" TS phono, or you can use simple RCA cables with adapters at the FBQ such as this one from Radio SHack.
Once you have the FBQ hooked up and working you can then use your computer with Room EQ Wizard software and an SPL meter to test the room and get filter suggestions to enter into the FBQ. The purpose here is to smooth the subwoofer response of any resonant peaks that occur at the general listening position. You don't need to get it perfectly smooth.
The REW HELP files are quite good.
Below is a hookup diagram of the FBQ/BFD in place and the PC hookup for testing your room.
Do your testing with mains speakers disconnected (with only the sub on) when creating the filters and equalizing the sub. Then add the mains once the eq is complete to get a look at how they blend with the sub.