I'm getting a Pro SW12 sub for practically nothing and would like to change the x-over for the speakers out from factory(200-250Hz) down to around 80-100Hz. This will be a secondary stereo in my bedroom. It may seem more than it's worth-but I'm going to use that sub. Anybody out there can help or done it before let me know. Maybe a schematic of it if any are available. Thanks to anyone who can help me on this.