Enclosure suggestion - 6th order similar to what Jack's sleeper setup was like, but tuned higher than Jack's was... Another example of 6th order blowthrough would be Supergumby5000 on CA forum. He actually used to run 4 15" Rs but it ended up peaking very low(like high 20s/low 30s).
i was looking at box designs. you said i should do a 6th order. but i am seeing there are two different types. a 6th order parallel tuned bandpass and a 6th order tuned bandpass. another guy gave me a link to db dynomax audio so i can read up on designing boxes. which 6th order is best for me to use?