How to connect two wall amplifier through OUT and AUX terminal, take SP-PW7825 as example

The video is suitable for PW7825 PW7825M PW7825K PW1825 PW1825K, take SP-PW7825 as example for how to connect two wall amplifier

[@haleyamaro8903]

What is the power source? Do I just connect the positive, negative and grounding wire from my outlet to the back of the product? Thank you!