I am looking to add a powered sub underneath the passenger side front seat in my 2018 Pilot Elite. I would like to connect a speaker to line level adapter to the wires at the factory amp on on the two rear door speaker wires. I know the factory sub is mainly for noise cancellation. Any insight would be appreciated. I would insert the wires into the molex plug and tape them in place so they woulnd't slide out rather than splice into my vehicle wiring.