11-30-2021, 02:52 PM
Just did a youtube search for 40khz sound. Found a 10 minute clip. At normal audio levels, I hear nothing in my office (street noise outside and ticking pocket watches in the background). Cranking up the noise to 80% max, I can hear a high pitched whine. Is that the 40hz or just feedback from my speakers? I've got pretty good desktop speakers (audioengine A2s with ARCAM DAC attached to computer).