3.5mm R+L IN
You can connect smartphones, laptops, etc, with the 3.5mm cable to stream background music for your speech and singing. You don’t have to use the input jack if you are not required to have the background music.
R+L OUT
Use the 3.5mm to RCA cable to connect the smaller R+L OUT of K036A to the RCA in on your amplifier or sound Bar.
Use the 1/4 audio cable to connect the bigger R+L OUT of K036A to the 1/4’’ MIC in on the powered speaker or sound board.
You can refer to the video from 3:10 to 4:10.