I've just started to upgrade my factory door speakers to new ones, and while I have my front two door speakers wired and installed, I've learned that these two along with the factory rear speakers are ALL out of phase... Is this normal for a Kia? Because I wired my new speakers with positive to...

I have a 2015 Kia Optima with the Infinity Sound System in it. It states in the documentation that the Factory Head Unit connects to the Amplifier via Optical. Could I add an Audison BitOne with Optical In and Out in between the Factory stuff to get processing power?

Hi all, I'm new here. I'm leaving in 2 days for a long trip in my 2005 Kia Spectra5 (hatchback version of the Spectra). It has the regular stock radio that comes on the car originally. I want to get my iPad's audio to come through the stereo. FM transmitters aren't cutting it any more. Is...