2volt headunit vs 4volt headunit which is better? what are the benefits of a high voltage sub output? I currently have a 2v alpine that i'm thinking of replacing I'm thinking with my current setup that I can use a little more power but idk If i get a 4v, will i have 2 retune my amps? Will I end up just turning my amps down with a 4v, and have the same results as b4? Would it be better to put that money towards a big amp? (money is rare)