Ya like the other guy said but

It would be four across still but put the first one low in the box the second one high the third one same as the first and the fourth one same as the the third.
As close together as height will permit,I hope that makes makes some sense cuz now im confuzed,lol

 

you mean like this : 0
0 00 ??

 

I think he means like this:
O-O
-O-O
Then squeeze them tight to each other so all of their frames are just about touching.

 

Ya thats it....

 

So how did this turn out for you? Its a few years later, did you get em all in? I love subs, and I love probes. haha. perfect combination if you ask me

 

Best box for probe that isnt a wall. Subs and ports facing up.

 

sold the 10's, got 4 SWEET IDMAX subs that will be sealed, subs facing up towards the hatch