If you have the means to reproduce them accurately, these tones should give you a decent map of your hearing range. If you want to do a serious evaluation at home, this hearing test CD is very useful. The normal range for young people is 20hz to 20khz, but high frequency perception declines as we age. The samples are more tightly spaced near the extreme high and low end since that's where hearing falls off. One hertz (hz) equals one cycle/vibration per second. Most music resides between 40hz (bass) and 15khz (cymbals). Note that some of these tones sound much louder than others even though all have the same peak waveform. These variations in the ear's sensitivity are the key to perceptual coding.