There are a lot of functions wrapped up in the Stereo Switched Jack, so you have to have a good understanding of the Acousti-Phonic to make changes in this area.  The main function of the jack is to turn off the battery when no cable is installed.  Note that the switch in the Stereo Switched jack works backwards -- open is on, and closed is off.  Many other wiring options are possible, and you can use dual jacks or SwitchCraft deep jacks, but you have to make sure all functions are addressed correctly or the Acousti-Phonic won't work properly. Check out the wiring diagrams in the Knowledge Base on this Web site.