I was listening to a Spyro Gyra SACD with a 5.1 mix the other day. Great music, btw, for demoing speakers and audio equipment. Anyhow in one song there is a long bass guitar solo that's mixed entirely in the center channel. I was paying close attention to the drivers in my VP180 during the bass solo, and I noticed during the lowest pitched notes of the solo, that the midrange drivers were moving quite a lot, with large extension, along with the two woofers. I would have thought that the crossover electronics in the VP180 should send the low freq signals only to the woofers, but it seems the mid range drivers are also getting low freq signals to cause them to move with high extension. Is it possible he crossover in my Center is defective or is this normal operation?