I have the Sony sub as well as a Yamaha YST40. I don't set my crossover higher than 80 hz since the sound starts to get directional after that. I initially had the crossover almost maxed out, and while I would get alot of bass, I was always aware of the source. After a little more reading I turned it down and now there is nice non-directional bass. I also set my fronts to "large," since they put out good bass (JBL S38s).