I was wanting to install some subs and an amp to my car but I was wondering if I could install an amp, after installing a blitzsafe hon aux dmx v.2x. Will it work out?

 

the aux input adapter is completely separate from adding an amplifier and subs. so yes, you can do what you want with what you have.

just get an amplifier with an auto turn-on feature for the high-level inputs. that way you don't have to hassle with getting a remote turn-on from the factory head unit.