frequency response on HUs
Yankee
Joined: Oct 2003
Posts: 3,599
conversely just because a product doesn't claim HF extension out to microwave energy doesn't mean it isn't there (as it would scare away some folks thinking it will have too much HF energy). I do not think there is a universal answer and I wonder if the extended HF is shat or shinola.
a side note:
FM radio doesn't have good high frequency extension and you usually dont miss it... FM radio can be quite satisfying, until you hear the same song on CD and it seems so much brighter but with more depth and better image placement... (my magnum dynalab is BY FAR the best sounding radio I have ever heard and the missing 1/2 octave isn't terribly noticeable)
500 Watt CAFz'r
Joined: Jan 2008
Posts: 537
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.
Originally Posted by AAAAAAA
What kind of sound or instruments has harmonics that go past 20khz?
Bells are known for subharmonics.
Originally Posted by AAAAAAA
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?
i didnt miss it, i kept it simple for your sake based on the elementary terms you were using to help the original poster, and it didnt seem as though you understood or knew anything about harmonics by your previous posts either so i wanted to keep in plain and simple terms......glad to see you took my advice and googled it before reposting though.....
although I've never used it to look up information on acoustics. I got most of my info from my good friend Penn who is a acoustical engineer, and from Elite car audio back in the late 90's. 
2000 Watt CAFz'r
Joined: Jan 2001
Posts: 2,026
Is all of this banter really helpful to the OP?
As a newbie entering the hobby are these really the forefront technical details that need to be acquired first?
This is all theory . . . I would like someone to take a HU with a freq. response that tops out at 20,000Hz, and use it in a system with quality amps and speakers, then trade it out for an equally priced HU that does 24,000Hz or more. I doubt that anyone of us would actually HEAR a difference - yes there might be technical equipment that might notice a difference, but if a stereo is designed to sound good to a machine, something has really lost focus.
As a newbie entering the hobby are these really the forefront technical details that need to be acquired first?
This is all theory . . . I would like someone to take a HU with a freq. response that tops out at 20,000Hz, and use it in a system with quality amps and speakers, then trade it out for an equally priced HU that does 24,000Hz or more. I doubt that anyone of us would actually HEAR a difference - yes there might be technical equipment that might notice a difference, but if a stereo is designed to sound good to a machine, something has really lost focus.
this is why my original posts were simplified, until defro decided to add only critisims to the thread which are of less value than the highly technical acoustical theory explanations which apparently are needed in order to not be heckled by the peanut gallery of armchair experts.
Guest
Posts: n/a
the original poster had gotten the simple answer that he was looking for and then the thread changed direction and thats not a bad thing is it?...........im sorry if i hurt your feelings sikk but im glad you have person that you can ask questions to rather than winging it
Violin maybe, cymbals probably, but distorted electric guitar most certainly. Is it captured on recordings though? Bells are known for subharmonics.
Bells are known for subharmonics.
Not sure what you're asking here but
However I was asking defro as like someone else has mentioned, he seems to have quite the chip on his shoulder, perhaps deserved, but little content is being provided here besides entertainement value that is.
His explanation of harmonics didn't make total sense to me especially when he says 5k has harmonics one octave above and below (and so on) when from my understanding if you are playing a 5k frequency or tone that's it ...and that's why it doesn't sound like an instrument (because there are no harmonics). When playing an instrument, the lowest harmonic is refered to as the fundamental and that there are no lower ones.
500 Watt CAFz'r
Joined: Jan 2008
Posts: 537
As far as the original post goes, I don't believe it's necessary to have extension outside 20kHz. Especially considering most of us don't use a recording format that supports it. Amplifiers have extended range in order to maintain stability by pushing the Nyquist frequency well outside the amplifier bandwidth. CD players do not suffer from stability issues and therefore only need to be able to cover the frequency range supported by the recording format. Just my opinion of course.
CD: 22kHz
DAT: 24kHz
DVD audio: 48kHz-96kHz (depending on sampling frequency)
