|
The frequency response of the human ear is generally agreed to be from 20 hertz (Hz) to 20,000 hertz. The lowest sounds in music are called bass notes, and sound below 80 -100 Hz is considered deep bass. Hertz is the term for how fast something cycles or vibrates per second. If you had something turning or going back and forth 20 times a second, (or 1,200 times a minute,) that thing would have a frequency of 20 hertz. The higher the frequency (the faster the motion), the higher in pitch the sound will be, and the lower the frequency (The slower the motion), the lower the pitch.
If you have ever had engine noise leaking into your car stereo sound, you will remember that the noise rose and fell in pitch with the engine, letting you "hear" the engine's speed. In a standard speaker with multiple cones, an electronic device called a crossover splits the music signal and sends the proper frequencies to each cone. | 
