I have one of those polk external subs and had 2 pins connected to it a few years ago with no problem. DP and JD.
Sold JD and now have Stern SW connected and as soon as I turn one of the pins on, the other pin that's still powered off gets this horrible feedback blowing through the speakers. Happens vice versa too.
Everything is hooked up right. Is there a setting that I need to change?
Any help would be appreciated!