Phoenix Gold Phorum

I'm planning a sealed box that will hold 2 RSDC10.4 subs.

The recommended size PG gives is .382 cu.ft which seems awfully small.

Does anyone know if what they recommend is best or is it better to go bigger?

^i think that size is before driver displacement. but it does have a very small box requirement. i would shoot for between .5 and .65 overall volume