[ClieOS]

A few interesting observation as I repeat the test, but with different gear:

1) With my PC on-board sound card headphone out, I can hear everything with my AD700. Same result as my first time when I used my Altec Lansing speaker. The only difference is, I can detect that the volume is going down as the freq goes up with headphone, but not much with speaker.

2) With my Go-Vibe USB DAC, I can only hear up till 15kHz before I have to turn the volume to max to hear the rest of the freq (was on 1/3 max before).

My conclusion is that the test is heavily equipment dependent (and it also tells me my sound card is less roll off at higher freq than my DAC).

 

[Caution]

I can't hear above 16khz, and I'm 18. I do believe that this test is heavily dependent on gear as well.

 

[DrBenway]

O.K., here's a question that I haven't heard anyone ask. How could a tone of that frequency POSSIBLY be reproduced by the garbage speaker that cell phones play ringtones through?

I believe the file actually encodes a tone at 18k or whatever it's supposed to be. I believe there are people who can hear to 20k and beyond. But I just don't believe that a cell phone can audibly reproduce that freq!!! The idea that kids are using this to covertly call or text each other sounds like high-grade hooey to me. I'd love Snopes to take a crack at this one.

I've been hearing about this alleged ringtone for over a year; I've heard segments about it on the BBC World Service and on NPR. There have been multiple threads about it here at Head-Fi (no worries, it's a fun topic, I don't mean that to be critical).

 

[Dreadhead]

Quote:

Originally Posted by ClieOS /img/forum/go_quote.gif A few interesting observation as I repeat the test, but with different gear: 1) With my PC on-board sound card headphone out, I can hear everything with my AD700. Same result as my first time when I used my Altec Lansing speaker. The only difference is, I can detect that the volume is going down as the freq goes up with headphone, but not much with speaker. 2) With my Go-Vibe USB DAC, I can only hear up till 15kHz before I have to turn the volume to max to hear the rest of the freq (was on 1/3 max before). My conclusion is that the test is heavily equipment dependent (and it also tells me my sound card is less roll off at higher freq than my DAC).

I think it's likely that your DAC is actually doing the job correctly and the soundcard is not. I say this because with my Benchmark DAC1 (which comes with test plots showing FLAT response) powering a GS-X or beta22 into 650's, D5000s and SA5000 I can't hear past 15.5 or so. No big surprise there; too many loud concerts and I'm 28. Also so you know I looked up on another site and the OHSA website and that's about right for my age the numbers on that website appear to be wrong.

But if I don't use a pure sinusoid (my signal gen software allows square waves, sawtooth, etc...)then I can "hear" the other tones as well.

 

[Envoy of Light]

Can't hear anything higher than 20Khz(Can hear 20Khz).
I assume it's alright.

Edit: When I downloaded the 21Khz and the 22Khz noises i could hear them very clear when played in Winamp.

 

[ClieOS]

Quote:

Originally Posted by Dreadhead /img/forum/go_quote.gif I think it's likely that your DAC is actually doing the job correctly and the soundcard is not..

I think neither are doing a great job. I just ask my sister to listen to those tracks with both my sound card and DAC, and she told me that she hear (and doesn't hear) the same sound as I did. She is 10 yrs younger than me and I don't think the chance of us sharing the same level of hearing is very high.

Myth busted?

 

[milkpowder]

20kHz on my HE60
19kHz, just, on my Logitech speakers

I doubt I would pick up on a 19kHz or 20kHz "ringtone" unless it was really quite loud. It would also have to be in a very quiet room as even the slightest noise drowns it out.

 

[progo]

Is there something wrong with those? I hear those very weird. The 22k one gives just low frequencies. And the "lower" gives very different results. Weird. Or is it? Did I misunderstand the concept?

 

[dreamwhisper]

I could hear them all, but the 22 was half the volume of the 19.

 

[Navyblue]

I wonder if some hardware cuts off the very high and the very low frequencies?

I can hear up to 17.4kHz, PC -> Creative Sound Blaster Digital Music SX -> Rotel RC-970BX -> Carver AV-405 -> cheap Chinese speakers -> my ears -> my brain -> my consciousness. Who should I blame?

 

[nff]

on my crapy phones i can hear up to 20 but its faint.... could also be that i just got back from a metal concert like a day ago and the ringing in my ears hasent stoped yet.

 

[Solan]

I can hear up to 20. I'm soon 42.

 

[small.solar]

Quote:

Originally Posted by dreamwhisper /img/forum/go_quote.gif I could hear them all, but the 22 was half the volume of the 19.

I am in my 30s'
and similar result here 21k and 22k just sounds like very low volume pink noises, maybe my headphones rolled off badly on high freqencies.

 

[Punnisher]

Quote:

Originally Posted by DrBenway /img/forum/go_quote.gif O.K., here's a question that I haven't heard anyone ask. How could a tone of that frequency POSSIBLY be reproduced by the garbage speaker that cell phones play ringtones through? I believe the file actually encodes a tone at 18k or whatever it's supposed to be. I believe there are people who can hear to 20k and beyond. But I just don't believe that a cell phone can audibly reproduce that freq!!! The idea that kids are using this to covertly call or text each other sounds like high-grade hooey to me. I'd love Snopes to take a crack at this one. I've been hearing about this alleged ringtone for over a year; I've heard segments about it on the BBC World Service and on NPR. There have been multiple threads about it here at Head-Fi (no worries, it's a fun topic, I don't mean that to be critical).

Snopes doesn't have to do anything about this, because it really works. A co-worker had one, and as soon as it rang I asked what the noise was. He told me it was his ringtone, and everyone over 30 next to me couldn't hear it.

 

[Elluzion]

not a very accurate test..