I did a search on this topic but to be honest, most of it didnt make a lot of sense to me. What I'd like to know is, in words of one syllable, how I can make a frequency plot/curve of each of my speakers, including my sub? I have a Radio Shack SPL, a compensation chart for the SPL meter, and a DVE disc. The problem I see with the DVE disc is that it only does a discrete Frequency Sweep (15Hz - 20KHz) for left, centre and right speakers. This means I cant plot the surrounds. There is however a Bass Management Test (15Hz 150Hz) for all 6 speakers so at least I can get that part of the frequency band covered. Should I even be using these test tones? What about White or Pink noise tones? Or are they just for setting the reference 75dB level? The main problem though is the sweep happens fairly quickly and its obviously impossible to manually record the meter readings for every single Hz. I suppose this is where the OUTPUT jack on the meter comes in? What do I need to connect this to? The AUX input on the PC soundcard? Thats going to require a fairly long Phono-Mini Jack cable so is not very practical. And what application would I use to record the resulting data? As you can see, I have almost no idea what to do so can anyone summarise what equipment (hardware and software) I need and explain very simply what I need to do? Or alternatively point me in the direction of a site that covers this in detail?