compare the 600/650 at LEAST. if you have time, Mag3 would be nice
Windows Sound Recorder lets you record 60sec at a time
if you choose to save as a wav (only option in windows sound recorder) make sure you choose the following:
11.024khz, mono, 16-bit
or filesize will be quite large (think 10MB/min)
heatset mic should be enough for accurate freq. analyzation, if not, will at least let people hear the difference, like what cathar did with a couple 80mm fans and the orig. D4
you don't happen to have one of the org. D4s, do you? that would be most useful in comparison
also, do you have any info on nikhsub1's concerns with performance change?
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