<font color='#000000'>ok, lets say your receiver produces a frequency from 20hz-20khz. We have to split that frequency BTW the sub & the other speakers. Due to the fact that the small satt speakers can not reproduce bass, at all it looks like, we have to make that sub reproduce it. In a basic system, you would split the frequency at 80hz, sending every frequency below 80hz to the sub, & every frequency above 80hz to the other speakers. Then these other speakers split what is left BTW them sending 80hz-4.5khz to the mid & 4.5kz-20kz to the tweeter because they have an internal crossover!</font>