You'll also notice that you (and most people, by the way) tend to use higher tones when talking to a baby. (babypreppers.com)
To be honest, these speakers are very high quality, and feature low, prominent bass and clear high tones. (androidauthority.com)
When high tones accompanied white squares and low tones were matched with black, the animals picked the correct colour 93 % of the time, on average. (scientificamerican.com)