I had a question about the different crossover frequencies on recievers. I'm trying to decide between the Onkyo $300 model with the 80, 100, 120 Hz frequencies and a Pioneer with 100, 150, 200 Hz. Could someone explain the differences between different crossover values? As I understand it it will only send values above the crossover to the satellites and below to the sub, so why would you want to have a crossover so high (200Hz)? Thanks.