Hello everyone,
I am hoping someone can help me with the following problem. I have an Asus Xonar sound card which can handle sampling rates of 192kHz @ 24bits. I assumed that it could then play back sounds up to ~90kHz if I used speakers capable of these frequencies. Apparently this is not the case. From what I have found out, all commercial sound cards come with some sort of low pass or band pass filter which filters out all frequencies above ~20kHz. After testing, it appears this card does not have a simple passive filter but probably some type of digital filter or active filter. Does anyone know of a way to disable this filter? I am hoping it is a physical component on the sound card board which I can bypass or de-solder. Or if there is another sound card which is 5.1 or 7.1, supports openAL, and can play ultrasound frequencies, that would be great too. Any help would be great!
