Idealy would be zero drop but realistically ied be happy with maintaining a strong 13.8 volts. It's a small daily system just for pleasure bumping. Do you think it would be better to go with the 1200s or just one d3100.
Personal opinion is just run 12 volt and double up on amps. Money you spend doing a higher voltage could be used to make a stronger 12 volt which is easier to do. And prob cheaper And just POP for a new NS1 sundown amp.. bingo