2v is pretty low but it can work, you have to turn it allllll the way up though. I did the 4 channel mod and ran my front pre outs down to the amp and the sub pre outs down as well. For my alpine I have subs set to +15 volume and I have the cross over set to 80 on the fronts to cut out some bass in the doors. Sound quality is great and it still vibrates your *** and mirrors when the subs are in their sweet range frequency wise. Volume is usually between 3/4 and full for me. I have been wanting to see if I can get the speed sensing function to work in the coupe, just a tad bit more volume with my current setup would be perfect for my ears. Most iTunes material is fine, pandora etc are slightly lower on output so you can't quite blast it.