In the choice of high, the maximum power of the premise, the most critical is the high sensitivity and frequency divider. (, (such as 20Hz-1.2KHz from point 2 tone in the audio range effectively divided into two bands, because rely on a single speaker's voice can't cover the whole audio signal (in certain sound pressure level vanhee), for example, we often know the frequency 1.2KHz it bass unit 15 inch) to sound 1.2KHz-20KHz the treble unit 1 inches tweeter driver) to sound, suppose now that the speakers are playing pop music, we simply said that the bass bass is from 15 inch bass and treble "iron triangle" is from 1 inch drive. Now you may have seen, 15 inch woofer and suffering of the power is much greater than 1 inch tweeter 

driver under power. If you think you hear very well, then we tell you, 80% of the power on the 15 inch bass, only less than 20% of the power is out from the high pitched. Here we say, 8/2 sub power, in fact, if the frequency point up or down, the power of the distribution is different. 800Hz frequency point, the ratio is about 6/4; the frequency point is 4.5KHz, the proportion is about 9/1. So: for the 2 division of the speaker, the sound is different from the bass power is different, this difference is changed with the frequency point of change.