Whether it takes 20 minutes or 200 hours, they break in. I will tell you that I don’t have 200 hours to waste. We apply voltage to get the drivers to 80%of their excursion level. Woofers for 30 minutes at 20 Hz free air. And compressions drivers at 100 Hz for 30 minutes, no horn load. We check to make sure that they have achieved natural state by letting them cool down and doing a freq and impedance. And you would surprise when they line up almost on top of each other. And when a driver doesn’t, then something else is wrong…….there. I said it.