Oh cool, no I haven't tried using white noise. I don't really know much about it to be honest. My limited understanding is that the white noise measurement will show the effects of harmonic distortion in the FR curve more than a sine wave frequency sweep measurement. The sine wave measurement will be more pure, in that it shows what the speaker is capable of reproducing in a narrower range. In a white noise measurement your driver is playing all frequencies at once so there will be more distortion. Which method is a more accurate reflection of the drivers ability to play music well I do not know. I think either method should serve a similar purpose and work well as long as you are comparing apples to apples.