I have an SB Audigy 2 card and I was going to use it for a quick freq response tester of a passive audio component that I have.
Well, the results that I'm getting is very strange. I'm using the output of the sound card fed back into itself on the input. (basically line out to line in).
I use a 20hz to 20khz sweep and I get some type of octave distortion at about 10khz that gets stronger all the way up to 20khz.
Here are the frequency responses
Does anyone have an explination for something like this? Is the soundcard bad or is there some type of coupling issues(I'm just using a standard patch cable)?
Thanks, Jon