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Old 28th September 2007, 04:12 PM   #11
badman is offline badman  United States
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Quote:
Originally posted by Colin
Yes, interesting point. Apart from those who use the super-audio CD format, ultrasonic tweeters are going to be a waste of money.

Not exactly... LP goes to 50kHz. DVD-Audio also has a higher cutoff. And part of the supertweeter's purpose is to flesh out off-axis response in speakers with high treble beaming.
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Old 28th September 2007, 05:08 PM   #12
Colin is offline Colin  United Kingdom
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Ah, I didn't know DVD audio was still going. Can LP really do 50kHz or is it just noise at that level?
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Old 28th September 2007, 06:42 PM   #13
DonoMan is offline DonoMan  United States
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Quote:
Originally posted by adason
what, you wanna play music for bats?
i bet you can't hear above 17kHz

Your hearing must suck. I can hear above 22kHz, though not as well as I can at, well, lower than 22kHz. In one of my electronics classes a few years back, we hooked a signal generator up to a small speaker and just went from like 10kHz up. Most people could hear to 18-20kHz; I went up to about 23kHz without having to turn up the amplitude (again, at a reduced volume though).

However, either way, I don't think it's an important range.
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Old 28th September 2007, 07:42 PM   #14
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Well DonoMan, do not be surprised if your ears have turned worse at these "few years back". I had no problems with +22 kHz when I was younger. Now I've problems to hear 18 kHz, all I say that it is age related.

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Peter
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Old 28th September 2007, 08:11 PM   #15
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Quote:
Originally posted by Geoff H
The question remains, how is this high frequency recorded? Microphones? Mixing desks? And if it is, how does it get any futher. The sampling rate used is not high enough, so it's not there in PCM recordings. And vinyl couldn't cut it.
Most anti-aliasing filters remove any content above 20KHz with standard CD 44.1KHz. Even with 192KHz sampling, I wouldn't be surprised if filter specs stayed the same... With all the crappy CDs out there (recording quality, not musical talent) I can't see many of the people in record industry caring about anything over 20KHz.

I would imagine though, at a concert or private playing that some instruments' harmonics extend above 20KHz and it may make the sound different...but there are usually a lot of other noises going on too to mask it...
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Old 28th September 2007, 08:20 PM   #16
tinitus is offline tinitus  Europe
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Amps are said to introduce phase issues if bandwidth is limited, but maybe thats different
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Old 28th September 2007, 09:35 PM   #17
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I might add that while SACD is beautifiully linear up to about 25KHz, above this the DSD process chucks out huge amounts of noise, swamping whatever information might be there anyway. Most LPs are about done in practical terms by ~18KHz IIRC. Again, above that, assuming there is anything, will be noise, and very few pickups can get up that high. I seem to remember a test LP with a 20KHz test, and that's the highest I can ever recall being used.
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Old 29th September 2007, 12:31 AM   #18
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Even a budget moving coil cartridge will trace beyond 25k, and the mastering cutter heads are good to 50k. Moving magnet cartridges have problems above 20k because of inductance, but the better ones, with lower output, go to 30k or more.
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Old 29th September 2007, 12:47 AM   #19
OzMikeH is offline OzMikeH  Australia
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Quote:
Originally posted by DonoMan



Your hearing must suck. I can hear above 22kHz, though not as well as I can at, well, lower than 22kHz. In one of my electronics classes a few years back, we hooked a signal generator up to a small speaker and just went from like 10kHz up. Most people could hear to 18-20kHz; I went up to about 23kHz without having to turn up the amplitude (again, at a reduced volume though).

However, either way, I don't think it's an important range.
His hearing does not suck, I can hear to about 19.8k. Unfortunately where I work a 20k test tone on the public address system has a harmonic at 18.6kHz, I am the only one out of 350 people who can hear it. At first the PA system vendor didn't believe I could hear it. That should give you some idea how lucky (?) you are to have such extended response. Your hearing is abnormally good, I suggest you take up shooting as a second hobby - it will make your audio hobby much cheaper.
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Old 30th September 2007, 09:19 PM   #20
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Your hearing is abnormally good, I suggest you take up shooting as a second hobby - it will make your audio hobby much cheaper.

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