I just connected it to the fuse. I never turn off the stereo just turn it down. So it going up and Down when I start and shut off the car is the direction i took.
The installer said he would have installed a relay or different fuse to have it the other way around and it would have costed more money so I just went cheap
.
So it’s been a few years now and happy to report it still works flaiwlessly and sounds great and no fading of the aluminum.