You could look to getting a cheap standalone EQ to reduce the bass that reaches the sub.
Neat, I didn't know about standalone EQ programs. I googled about them and they seem interesting but is it a significant difference than integrated EQ in Windows Media Player?
Also if you have any recommendations on the top of your head I'd appreciate it. There are so many out there it seems.... I would also need something that is easy to use with preset options, I suck at setting EQ's.