Noob diamond audio d5600.4 no output on channel 1 and 2

I'm a dork, so a made a little video showing the amp working
I am running it with channel 1 and 2 running some smallish 6 ohm Bose speakers I have set up in the garage, and a small 4 ohms subwoofer hooked up to bridged channels 3 and 4. Source is the tablet running Bluetooth through a car stereo. Rca from the stereo to channel 1 and 2, and providing signal for all 4 channels. Fun times. Anyways, check it out! It's alive!

YouTube