The switches are nothing to be afraid of, I have read lots of posts no to people have gotten the switches set the same way. Mine came in all up except 6, 5 and 6 are just the crossover point, 5 up 6 down will put more midrange through the sub by using a higher crossover point. 1, 2, 3 are output levels all up is the highest output level. 4 needs to be up or it won’t work. This amp is used in lots of applications it is not set for our trucks, the enclosure is designed for our trucks. If you don’t like the sound of the sub adjust the switches, you can always put them back just write it down.
When you buy the sub they don’t know if you have the Bose or non Bose It works with both, the switch settings are different.
The install is pretty straight forward but you will have to get the kick panel off, took me about an hour.