Looking to add a little bit of bass using an active underseat sub. I'm using a standard manufacturer headunit which has no RCA outs and I'm on a budget so an upgrade is out of the question at the moment so that leaves me with using the speaker level input on the sub. I know its not ideal and I'm not expecting super quality, just to add a bit of depth to the sound.
I have never wired anything like this up to a speaker level input, so what are the basics? Do I just tag on to the nearest speaker and carry the wire onto the sub which would give you only half the signal if something is in stereo, or do you connect at the headunit to both the left and right channels?
Just some basic info if someone can give me the jist.