New amp and subs

So, my cuz has an mtx terminator amp and 2 10's combo with a terminator box. Anyway, he had best buy do the installation, I didn't want to touch it cause it was going into a beamer. Anyway, he's unhappy, the bass hits real hard when its supposed to be soft, and doesn't hit when its supposed to hit hard. Any idea why?
 
Lol I know :( He bought em without telling me :nonono:. He was so set on RF's but then goes out and gets mtx's sigh.

But after looking checking it out online I finally was able to find where that dumb control knob is on the amp, I think the best buy guys turned it up too high and the terminator amp just doesn't have enough power to output that much electricity at hard hits. I think they wired it really weird as well.
 
So, my cuz has an mtx terminator amp and 2 10's combo with a terminator box. Anyway, he had best buy do the installation, I didn't want to touch it cause it was going into a beamer. Anyway, he's unhappy, the bass hits real hard when its supposed to be soft, and doesn't hit when its supposed to hit hard. Any idea why?

sounds like its out of phase or something. Why not take it back up to the idiots who installed it?