I've been trying to find a Bass Alignment filter for my B&W Matrix 805s, but have been unsuccessful. While searching I came across this thread http://www.diyaudio.com/forums/multi-way/35668-anyone-reverse-eng-801-bass-alignment-filter.html. That got me thinking maybe I could build one. I'm not too savy in the engineer department (though I would love to learn), but I can read a schematic and operate a soldering iron, multimeter, and scope. I wanted to see if someone here could help me out on the design of a BAF for my speakers. From what I understand, the BAF is a high pass filter with a bump at the speakers port frequency. I'm thinking a bump around 40 Hz, with a rolloff of the low side, would do the trick Anybody want to help me out with this?