Hi I have recently purchased a new Bk monolith and thought i'd have a play with REW. I finally managed to get it working on ubuntu (linux), I think. Having bought a radioshack SPL meter from amazon, im not sure if the calibration file will work for this meter as it looks different to every picture ive seen of the radioshack meter?? The REw graph shows a massive peak at 40hz. Where i can position the subwoofer is very limited so i am wondering if a BFD would help in this case or whether i should invest in an antimode??