8" subwoofer?

hi there, im new to this site and im very excited to be here, im asking for some advice from you guys, i have aquired an isoberic speaker but want to convert it into two 8" subs, what would be the best design for such speakers.
also if its best to leave as is how do i connect it to the two 10" carlsbro pa speakers i picked it up with in a charity shop, yeh result for 40 quid and its all as new

many thanks jtek

Not long after an old Chinese woman came back to China from her visit to her daughter in the States, she went to a city bank to deposit the US dollars her daughter gave her. At the bank counter, the clerk checked each note carefully to see if the money was real. It made the old lady out of patience.

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If you post the Ts of the speaker it will help. But I can't think of any 8 that will work as a sub