It has no reference to audio. It is the name of a rental car company.
It is a unit of measurement that expresses the number of complete cycles of sound per second.
It is referencing the sinusoidal wave form effect at a certain decibel level for audio speakers.
It describes the intensity of a note played at a constant volume level.
It is the last name of the man who discovered amplitude.
20 Hertz to 20,000 Hertz
35 Hertz to 50,000 Hertz
250 Hertz to 2500 Hertz
1000 Hertz to 20,000 Hertz
It is not possible to determine the average range of hearing for humans.
It requires less energy for us to hear a 1 kHz tone than it does to hear a 2 kHz tone.
It requires less energy for us to hear a 1/2 kHz tone than it does to hear a 1 kHz tone.
It requires less energy for us to hear a 2 kHz tone than it does to hear a 1 kHz tone.
It is impossible to determine which frequencies are easier to hear than others.
It requires less energy for us to hear a 2 kHz tone than it does to hear a 3 kHz tone.
You may have the master volume too loud.
They are sitting in a "hot spot" where your main speakers are directly pointed.
Your EQ may not be set so the ideal frequencies of individual instruments and singers are separated and heard clearly.
Hearing sensitivity issues may play a part due to the age of the person complaining and the frequencies most dominant in your mix.
All the above may be factored in as a possible cause for the complaint.
1 kHz to 5 kHz
2 kHz to 6 kHz
3.5 kHz to 7 kHz
500 Hertz to 2.5 kHz
10 kHz to 15 kHz