Nealon14

i have a ct sounds 1400.1 and getting a 125.4, so im guessing its around 2.5k rms total between both of my amps. I have a nissan versa 2012 sedan and i have no idea what the alt outputs. I should i mentioned that sorry. The largest battery i can fit up front is a group 51 according to the xs power website. i also took the measurements and it seems right. since i am going to need a bigger alt and stuff i would be better off getting the d975 instead of the xp975 for the rear?

Hey guys Iam planning on buying a xs power d5100r for my primary battery up front, but I am puzzled on the secondary battery for the back. I was thinking about a d975 or an xp975. What would I benefit from either? I know the xp975 has reserve power but doesn't the d975 have that as well? I am running about 2.5k RMS give or take. Can anyone help me out here if anyone has any other suggestions they will be appreciated. I have a stock alt btw

I usually leave it off. i noticed when i put it on the highs sound louder, so im guessing it introduced clipping.

1 4inch aero has 12.56in of port area. i dont think that is enough for an sa 12 if you are running some good power to them, so 2 would be closer to the amount needed. the length depends on what you want your box tuned to. the more ports you add the longer each port would need to be for the same tuning. search psp port calc in google and mess around with the numbers and see for yourself

if you like lows i would go with 2 cubes net with 30in^2 of port tuned to around 32-34Hz