I have removed all the seats and panels and gotten rid of the factory amp and sub. Right next to the sub is a little black box that says TDK on it. It has one black wire coming in on one side, and two black wires coming out on the other side. What is this little black box??

Also, I have stripped all the black covering off of the audio wires.... all the way from the end that was plugged into the sub to a foot before where the amp was. Now I see the connector that plugged into the factory amp... which wires do I run to MY AMP? In other words, which colors represent the LINE LEVEL SIGNAL? I only know that the solid blue wire is the remote.

PLEASE HELP!