LOL, my personal opinion is that I agree with you but was just stating what the more generally held arguments are over the sound engineering and DJing world in general.
What you have to remember is that, even forgetting MP3's, on full CD quality the sampling rate of 41kHz limits the frequencies to just a shade above 20Khz due to Nyquists theorm. And even if you have properly mastered vinyl or super-audio CD or something similar which could conceivably have some info above 20Khz, and even if that info makes it through the soundcard, mixer, processing and amps, it STILL isn't there because the speaker cant reproduce it to get it into the air for your ear to hear.
Only in a proper professional recording studio with top of the line large format monitors costing many thousands could you reliably state that sound above 20Khz may even have a chance of making it into the air for your ears to pick up. Soon as you step out of that room and into the real world its gone.
And note here i'm talking about sound that is reproduced through speakers, be it pre-recorded or mic'd up bands and acoustic instruments. When your hearing an actual instrument raw then obviously your not limited by all the electronic and mechanical gubbins we use to play our sound back to a large audience so your getting a fair bit of sound and harmonics above 20Khz then.
And yeah, Funktion One are great speakers, had the pleasure of mixing on them a couple of times in my live engineer life working with bands, right up there with the top designs in the world (when in the hands of a good engineer, F1 being one of the few top level companies left who try to make great sounding speakers at the component level and not try and rely on too much DSP for correction, are particularly susceptible to bad engineers footering too much and ruining a great sound).
However even Tony, who is one of the good guys when it comes to publishing honest measurements about his speakers and not trying to pump the numbers to make them look better on paper, only claims up to 18Khz for both his top of the line touring product the Res5 and also the Dance Stack which is what you'll most commonly hear in club installs.
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