ok, so i've got a sub, and an amp, and it's all running fine

and now i've bought another sub, so i'll need another amp

the question is, can i power the second amp off of the power cable that i've run for the first amp?

how do i know what gauge the original wiring is? it's blue cable with some silicone type covering and it's about as thick as my little finger overall

and if i were to be able to use this, how do i go about splitting it?

is there a specific distribution block for this sort of thing? i'm sure i've seen some sort of multi fuse block that has the power coming in one side and several going out the other, but then they would have to be of a smaller rating cable yes?

or should i just go to a shop and ask them?