The 2nd octave of 1000Hz is 4200Hz? Η 2η οκτάβα της 1000Hz ειναι 4200Hz;

Find out yourself.


Make sure you keep the volume down to protect your ears.


Try on Google (online signal generator).
http://onlinetonegenerator.com is an amazing website.


Choose sinewave.


Input 1000Hz for a few seconds so that you can remember.


Then try 4000Hz.


Go back to 1000Hz and try higher than 4000Hz until you find a satisfactory 2nd octave!