I purchased an Infinity Basslink powered sub. I don't know much about car audio, but installing it should be the same as installing an amplifier. how do i go about doing this? i have the wire run, but i don't know what to splice into what and i don't know what kind of power wiring kit i need. i'm keeping the factory head unit and speakers. i was just going to use speaker level via splicing since the head unit doesn't have inputs for audio jacks.