I am in the middle of writing an EXCEL based program that will hopefully get added to the FRC Consortium. Ed West started me up with the basic parametric EQ formulas. What it does is model the BFD gain and phase with your measured or simulated responced. For calculated responces, this is set up currently for a sealed box only to see what settings will work as a psuedo linkwitz transform. Best results work with Low Qtc systems (must be = to or lower than 0.6 IMO, but you may get away with up to 0.707). The equations I am using right now are just the basic ones from Brian Steele's website. I hope to later figure out what forumulae to use to account for box stuffing and leakage (Isaac????). For measured responce, you can use it to try and predict the best settings for the BFD to counteract room interactions. Since the room does not respond linearly with modes and nulls, this will work as a guide and not a one shot wonder. I will have the measured responce be selectable to use the RS SPL correction value and possibly your own correction values. Later I hope to work with Paul V on this to work on an importing feature from Unibox. Here is a screen shot of it SO FAR. Formating is not a concern at this point. I still do not have driver phase worked out, so it is not working yet in the sum. http://beyond_gomer.tripod.com/bfd.html Now for your Input 1) What type of resolution do you want? The higher the resolution, the more accurate the low bandwith gains appear. The higher the resolution, the more measurements you have to take. 1/6th octive is minimally adiquare IMO 2) Is there any additional thing I should try to incorperate, or is there anything I should change from what I have already meantioned?