Spldecendant
10+ year member
CarAudio.com Elite
4 d3100's With the 4 runs and the alt will be fine just get a volt meter....I used to run my 12k with 6 d3100's and 1 mechman 270a it would mostly stay in the 13's until I really beat on it then it would drop down to about 12.6v but that's close to the end of a song then I got another alt and voltage never drops below 14.1 starting at 15 and I added a 7th d3100.