The amp was dead on arrival. I didn't realize, so I spent tons of time debugging the missing sound until I realized that the LED on the board only lit sporadically but would not stay on. For the price, it wasn't worth trying to return. I'm trying to work around it now with some old pieces lying around.
I installed 2 130w 4” car speakers and used this amp with them. Very loud for us hearing impaired. So it works very good. Does have an adjustable volume control.