I had a student summer job at an employer with a benign attitude to "homers" - in our own time, we could create home-use circuits using lab supply components. Consequently, engineers were building audio power amplifiers with response curves well over 100KHz (to catch the beat frequencies ...) .
One day, I was being driven scatty by a high pitched whine. Meanwhile an owner of one of these audiophile rigs, a positively ancient 30 year old, could not hear a thing. Turns out a nearby instrument had a faulty switching power supply that was honking out 15KHz. I've never had much time for specs ever since then. If you like the sound, its ok.