Dual Sub setup question

[MJailme]

When you hook up dual subs, is it best just to split it once and have a single line running into each sub. Or split it multiple times so you can run a line into the R/L of each sub.

I'm thinking of splitting just once.

Getting another sub next week and need to run the lines through the walls before it gets here.

Also, Does it matter if you split the signal right out of the receiver. or could I split the signal at the end of the cable have have already run.

Thanks in advance.