I recently purchased a BFD to help out with how my new SVS CS-Ultra sub was responding. I’ve felt that I just wasn’t getting enough oomph from this sub like I should be. Here is how my room is setup. The sub is connected as follows. Pioneer Elite receiver VSX-26TX with the crossover set at 80HZ --> SVS black box --> BFD --> Samson 1000. The sub has been calibrated with a radio shack SPL meter using Avia at about +7 over my mains or 92 db. Here is the graph using the Stryke zone CD measured at reference level from the listening position using only the CS-Ultra sub. Since I can only mess around with my equipment one day out of the week – my brother currently has all my stuff while I’m looking for a house – I wanted to get input from people that are familiar with calibrating using the BFD on some filters I could try out so I don’t spend a whole bunch of down time with my HT. Thanks for any input!