Pictured is the PinWoofer Spike-2 12V Power Cable. Routes from the power jack on the amplifier to the backbox Power Distribution Board.
The Spike-2 Power Distribution Board can be seen within the yellow rectangle located in the lower right-hand corner of the backbox.
Shown within the yellow rectangle is header CN6.
Plug the 3-pin connector into this location. Note the orientation of 12V power (red) and ground (black).
Shown in the yellow oval, plug the opposite end of the cable into the Amplifier module.
Pinwoofer TM - ID § 48-501