Help with Aero port for 2 10 inch sub

[Bajan]

Should I use one 4" or 6" for my box? It is 4 cubic feet with 2 10 inch subs will be tuned at 30hz

[Joe X]

You are not saying what subs, in most cases two 4" or one 6" will do fine but those would need to be so long that it will be uncomfortable to fit them so I'd recommend using a slot port instead.

[Bajan]

It's just two old audiopipe I had knocking around. I'm from the Caribbean so it's expensive to bring in a sub but I am getting two massive audio GTX 10 soon. Not alot of brands available here