TPA3116 Class-D 2.1 Power Amplifier (2*50W + 1*100W Subwoofer)

Recently I was bought TPA3116 Class-D Digital Audio Amplifier on Online shop, that price about $12USD. This TPA3116 Power Amplifier has 2.1 channel output that has 2 midrange output speakers and 1 output for subwoofer speaker. In the mid output or L / R output of each power has 50w, while the subwoofer has a power output of 100W at 4 Ohm impedance. Below the description or wiring connection of