Sorry I'm not really sure where exactly to put this, hopefully here is okay? Recently I tried measuring a speaker through room eq wizard. I wanted to get a frequency resp graph. I changed none of the values, but the measurement fell off sharply at about 6 khz and then there was no output. I know the speaker can reproduce higher frequencies, and I know it's not an issue with the microphone because I could hear the sweep just fall off after 6khz also, so what can be causing this? It was working fine literally a few days ago...
This is a soundcard setting probably. It still could be an issue with the microphone, your ears drop off above 6kHz quite markedly, however if its changed since before, its the audio output path that's suspect. Doesn't REW have a standalone tone generator you can drive to sanity-check the output ?
Actually it was an issue with my setup, on the right channel for some reason. So I'll have to figure that out 😀