Altec designs were all bass reflex with that driver that I am aware of so look at the 9849 designs for one example of cab volume if you go that route. As an alternative to that, Baby Onken used a 414 driver and woudl be a fun wood working project. Plans are available on the net.

Anyway you stack it though, that driver does not do what I would call extended LF. It makes an awesome midbass driver though. My 9849-8D's like to cross over to a sub at about 60hz. Low bass is MIA.