[owyn]

My comment also contains the phrase "super interesting". Now I wonder where that comes from. However, technically to find the frequency in question you could take a white noise generating sound source and connect that to an EQ with an audible dB boost in a narrow range and sweep that through the entire frequency range until you tune it to match the noise in your ear. To create a filtered noise track you could apply a high pass filter and a low pass filter in combination to "bracket" that range and create a narrow band of noise. Enjoy the silence, and check out Aphex Twin (start with: selected ambient works 2). :)