The cheapest way I know to measure ultrasound is with this device. It makes normal .wav files, and you can check out the spectrograms in any audio editing software like Audacity (free). I don't think it's super well-calibrated, but it'll at least show you whether the ultrasound noise changes when you turn on the soundbar.
infrasoundjake t1_itlmrw2 wrote
Reply to Are urban environments "noisy" at ultrasound frequency ranges? If they are, does this cause problems for animals that can hear in these frequencies? by derefr
The cheapest way I know to measure ultrasound is with this device. It makes normal .wav files, and you can check out the spectrograms in any audio editing software like Audacity (free). I don't think it's super well-calibrated, but it'll at least show you whether the ultrasound noise changes when you turn on the soundbar.