First off, I found a Sony STR-V25 audio receiver in my basement. Its speaker output ports are two apparently right speaker outputs and two left ones but the left ones say impedance on them and instead of the standard red and black connector, they are white and black. My first question is what are those white and black connectors? Second, There was also a Rockford Fosgate punch HE sub woofer I found. It is a passive car sub and I am pretty sure it is 4 ohms. Is there any way I can connect the sub to the Sony receiver, which is 8-16 ohms?