In audio production, "low-frequency" usually refers to the 20–200 Hz range. However, the specific value is highly significant in technical circles for the following reasons:

When dealing with low-end frequencies (bass/kick), it is critical to ensure phase alignment to prevent "wobbly" or weak sounds. 7 kHz noise from your own audio?

This specific spike has been famously identified in major soundtracks, including Hans Zimmer's Interstellar . It is often debated in forums like Reddit's Audio Engineering community because many modern listeners using spectrum analyzers notice the spike, even if they can no longer hear that high a frequency due to age. Managing Similar Audio Issues

Tools like Soothe2 or standard notch EQs can target and remove a surgical spike like a 15.7 kHz whine without affecting the rest of the audio.

If you are dealing with a recording containing this or other unwanted frequencies, engineers typically use:

Often used for true low-end rumble (20 Hz to 1 kHz).