When stupid people speak out of stupidity, sometimes sarcasm comes from the intelligent to further demonstrate the stupidity of the banter . . .

. . . in as much as what happens in one octave affects the other octaves, we need to consider what is musical. Can anyone name a song that has notes higher than 16,000 Hz? Does anyone care?

I played with those test tones on that site (Run through pioneer home speakers which are rated from 30Hz - 20000hz). I heard the 16,000 Hz tone. I heard the 18,000 Hz tone, and there was nothing at 20,000 Hz. Maybe it was the speaker's short-coming or my ear's shortcoming. Either way, the 18,000 Hz tone was so irritating and piercing that I wouldn't want any music playing in that range - 16,000Hz was also piercingly high, but I think I have heard some electronic music that plays that high . . . I most often change tracks when it plays up that high.

To the comment about distortion from octaves, I heard that through my speakers at 18,000 Hz - which indicates that the upper limit of 20,000 Hz on my home speakers DOES impact their sound reproduction at 18,000 Hz. So great, the theory has been proven. But I for one, still do not care because 18,000Hz is ridiculously high, annoying and unmusical.

So keep on arguing, I'm going out to my car to play a 20,000 Hz test tone at full volume and pet the neighbourhood dogs.

 

an actual post that had use and wasn't just a cristisism or comment.

 

Have fun with those happy dogs. My whole point to egging you guys on in this conversation was tha there was alot of critisism and commentary and no actual useful information. For the record, I don't think there's anything involved with the acoustics field that I haven't allready learned extensive amounts on. I just tried to keep my earlier posts on topic and give the OP the general idea without wiring a text book o the matter.

Defro's post on harmonics was as basic as you can get to describe what harmonics are, also he missed that there are continuing harmonics every octave, each getting progessively quieter and quiter the frther they get away from the original being played.

If people would actually use effort in helping out the posters on this board, instead of wasting time stroking their own Ego's by critisizing other people who actually are posting useful pertinent information(If not in scientific formula with full theoretical explanations on every minute factor that relates to the topic).

Also if you check the hour of my firsts posts it might explain slightly as to wh my posts may not have expressed what I was thinking when I typed them 100%.

 

^^Just like you probably did last year or just prior to posting on this thread. We all do it, that's how we learn about everything...unless you actually are a physicist or engineer that studies sound propagation and has done the experiments first hand...which I doubt!

 

ohhhhh...try making a fried PB and banana sandwich...those are the bomb! Apparently that was Elvis's favourite sandwich...kind of explains his later chubbiness. Anyway, most audio geeks have heard about the 20kz and beyond harmonics, but for most novices that barely can grasp the amp-speaker relationship...it's probably best to avoid those topics. I think the OP will just get more confused about what the amp does, and how the speaker responds to it.

 

I thought the lowest frequency was essentially called the fundamental frequency and that is basically the "note" that the instrument is playing. Then from there the higher frequencies are the harmonics. All of those together is what allows us to distinguish a piano note from a guitar. So I am not sure what you mean when you refer to lower harmonics.

What kind of sound or instruments has harmonics that go past 20khz?

Lastely, during the recording with instruments that have harmoniks past 20k, one would think that the original 20khz+ harmonics present would affect the audible ones belo 20k... why would it be important for those higher 20k+ harmonics to affect them again during replay with a home or car system?

 

Because it's easy to achieve, improves stability, and most importantly to the marketing department: bragging rights.