Why is adjusting the frequency that comes out of the subwoofer so important?
We want the subwoofer to be a natural extension of our left, right, or center speakers in both volume and frequency. For example, let’s say the subwoofer plays from 150 Hz and down and the main speakers in the system work from 40 Hz and up. Between 40 Hz and 150 Hz, both the main speaker and the active subwoofer are reproducing sound. This will cause these frequencies to stand out as a “peak” in the response of the system. These overlapping frequencies will create “boom” in this region that will detract from the performance of the entire system. Likewise, if the main speakers play from 150 Hz on up and the subwoofer plays only below 50 Hz, there will be a large “hole” in the response that will reduce the impact and accuracy of the system. • How is the crossover properly adjusted? The lowpass filter on most subwoofer amplifiers can be adjusted between roughly 40 and 160 Hz. As an example of what it is doing, if we set the filter to 80 Hz, it will produce everything lower than 80 Hz. It
