I'm not sure what you mean. There is no two π subwoofer currently available. That would be a sub with a 10" woofer. I suppose you could make something with an Alpha 10 or HL10 or others, but there is no π speaker currently available such as that.There are other subwoofer models available. There is a three π sub and a four π sub. There is also a large basshorn sub called the 12π.
Alternatively, the two π tower hits the low notes very well. It hits 30Hz with authority, so no sub is necessary. Maybe that's what you want?