nick_charles
Headphoneus Supremus
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- Feb 26, 2008
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components in the audible range ?
The easiest way to find out is to actually try it with various headphones. In a quick test with random cheap headphones, I could only hear a 3 kHz IMD tone at higher than normal volume setting (and with a 0 dBFS ultrasonic signal that is unlikely to occur in music).
Originally Posted by nick_charles /img/forum/go_quote.gif
Was it from the digital source (two different PCs with different sound chips IDT and Realtek), DAC sections, the amp sections or the headphones.
Yeah of course you can hear a 3 kHz tone, but under real circumstances it may be masked by music if the level of the tone is low enough.
Quote:
That could be tested with some measurements on the DAC and amplifier outputs.
Indeed, a signal with very high ultrasonic content and silence in the audio band is rather unnatural.
the spectrum shows quite a lot of spreading, whether this is from the DAc or ADC I do not know
The second graph shows a lot of low level peaks, though, those could be some kind of DAC or ADC problem.