Subwoofer Under Seat Subaru Crosstrek 2019 Installation Alternative Method

Quick Video showing where my connections were made. I used the main grommet by Subaru. I used the Right Rear door speaker for my high side signal connections. I used a multimeter to determine polarity and continuity to determine the door speaker. I forgot to mention take the rubber door cable raceway off at the top and a connector will reveal its self. This was useful for continuity. Also, run the stereo and measure the polarity with the connector open. This is how I determined polarity. Use plastic panel removal tools from either Amazon or Princess Auto or similar. The plastic panel removal tools aid in panel removal without damaging. I did not want to tap into the head unit. Also use tyraps afterwards to secure cables. Wagos were very useful for making quick connections that can be modified later. GLTA.