I have some significant dips in response from my sub, mostly around 55-60hz and some peaks at other frequencies. I was considering the use of the Behringer Feedback Destroyer model DSP1124P and was tryin to educate myself as to how it can be used to equalize my sub's response. I downloaded the instructions at snapbug and it seems that the use of analyzing software is recommended. Unfortunately my computer skills are sorely lacking and the use of such software and the necessary equipment is sorta beyond my capabilities at this time. Would it be feasible to simply use the low frequency sweeps on AVIA and a Radio Shack SPL meter to find the dips and peaks in frequency response, write them down, and then by trial and error adjust the Feedback Destroyer to compensate? Am I correct in assuming that with the feedback destroyer one can choose what frequencies to boost or suppress and also the bandwidth of the correction? In other words the device is not locked into specific frequencies that can be adjusted but instead the user can choose what frequencies to adjust? I know this all sounds pretty naive to most of you but I was hoping that I could use this device without having to use a computer to analyze my frequency response curve. Thanks in advance for any help on this!