Why don’t more speakers have servos?

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Woofers—especially subwoofers—can be uncontrolled and distortion prone if they do not have an active servo to help them. Fact is, almost no subwoofers and active loudspeakers have servo systems today. Why is that? How hard is it to build and how do they work? PS Audio CEO and designer, Paul McGowan explains active motional feedback systems known as servos.