A few things: Make sure there is no filter on the pure sine wave you're using, whether in the synth or in the DAW. Make sure your headphones are rated for 20kHz+. Otherwise, it won't matter how high the synth emits sounds. Use a frequency analyzer (Spectrum in ableton) to visualize the sound to help your ears and confirm the sound.
Hopefully this helps.
it's not a synth, they have a tone generator in the option window.
You do need to increase the volume to hear the higher frequencies, just because they have a faster vibration and aren't as prominent as the lower frequencies.
Check out waves and amplitudes.
If you're really concern, go to a doctor, but it seems like it's pretty normal.
http://plasticity.szynalski.com/tone-generator.htmI used this thing and at like 9760hz, my right ear picks up more than the left.
14132hz is where my left ear picks up more than my right ear.
past the 9760hz, on it's way to 14132hz, the tones shift to the middle then at around 11686hz, is when i get both ears to sound relatively the same volume.
Probably a little biased towards the right.
I was also at volume level of 9% the whole time. 16134hz is where i have to crank up the volume 100%. I think that's also my tinnitus range.
the volume percentages were based off the site.
I think that's pretty ok, i mean, i don't know how symmetrical my ears should be, with some digging i found that each ear picks up different things. Right is more speech oriented and left is more musically oriented.
our faces aren't symmetrical, so i am not sure other than to go see a doctor if you're concerned.
http://www.healthyhearing.com/report/43310-Ten-signs-of-hearingi've also seen quite a few of these things pop up over the search.
