Originally Posted by Bigus
Not true, I gave the range above. It is valid for any definition of low frequency for any use, anywhere, at all times.
That is a pretty bold and broad statement!
Although I have seen that definition before, "for any use, anywhere, at all times" cannot apply.
For instance, many will define the range of "audible" sound as differentiated into 3 main categories.
1. Subsonic or "low frequency" sound being in the range of 20Hz to about 500Hz.
2. Midrange frequencies are said to inhabit the realm of 500Hz to 6KHz (6000Hz)with
3. high frequency sound being in the 6KHz to 20KHz range.
Then again, if you were talking "radio" freq., the definition would be
ELF Extremely Low Frequency 3 - 30 Hz
SLF Super Low Frequency 30 - 300 Hz
ULF Ultra Low Frequency 300 - 3000 Hz and
VLF Very Low Frequency 3 - 30 kHz
There are other examples as well.
So it really depends on how the term low freq. is being used, and often, who it is that defines it.
Saying "for any use, anywhere, at all times" simply does not work.