How good's your hearing

Why do we need speakers w/20,000 hz frequency response?

One word, "harmonics" second, third, fourth can go well over 20khz.
My Plasma tweeter can go to 100khz!!!! boy can you hear it on harpsichord compared to just the ESL's, the highs just dance in space in front of you, you swear you can reach out and touch them,

Cheers George

For some reason I can’t get any links to post now. Just google ’musical instrument frequency chart’ and you’ll see that the violin’s frequency range is from 200 Hz to about 1.3Khz with harmonics out to about 17Khz and the flute is about 250Hz to around 3.2Khz with harmonics out to around 12Khz. so if you can hear them, you're not deficient in your hearing. 👍

All the best,
Nonoise

so if you can hear them, you're not deficient in your hearing. 👍

Not really, you may hear the fundamental but not hear the 2nd 3rd 4th harmonics. 

How about 'sense' it as your mind fills in the gaps? I ask because the harmonics start right where the actual range stops.

All the best,
Nonoise