Some families like to install 4 headrests into a single vehicle but have concerns about only having 2 audio channels with the wireless headphones. We have the solution, it's a simple one really.
When setting up the audio signal for the headrests, start with the left side being channel A and the right side being channel B. Then in the back row seats, make the left side channel B and the right side channel A. This helps reduce any overlap of audio signal from front to back and allows for a better audio signal. This video will explain more.