Boy, I really should read these posts more carefully before jumping in with a response. Now as I reread your post, you're saying that all the bass for the surrounds is being sent to your sub. Why? What kind of speakers are you using for surrounds? Bass frequencies, according to the THX standard, become directional above 80Hz. Some people will say bass frequencies become directional as low as 50Hz. That means the bass from the surrounds will appear to come from the direction of your subwoofer and not the surround speaker. That could get a little annoying.

For most movies, your surrounds won't see frequencies that low. Multi-channel music is a different story. However, with most of those recordings, you still won't see frequencies down that low.

The only curious thing in your post now is why the crossover worked for one side and not the other. I would check the settings on the sony as well as on the ICBM. Also double check the settings on your playback device (Which is?). Just double check where all the crossovers are set. Also, turn up the volume on your sub. The information may actually be there but you might just not be hearing it.