I personally believe there is some break in and here is why. I replaced a woofer in my sons sub just before Christmas. After we installed it, it barely produced any bass, no setting had been changed. Within a few days the bass output was better than it had ever been. Same thing with my Yamaha powered sub that I replaced the driver in. When the speakers are designed they have many hours on them during design and crossover tweaking. Before they leave the factory they are fed a brief sine wave through each driver and monitored by a computer (axiom uses LMS ) program to test they are working correctly. So prior to you hooking them up they are fresh and stiff right out of the box. There is a reason why new surrounds are available. That's my thoughts take em or leave em
Richard
