A plain SP-12 has a huge AlNiCo magnet. The SP-12B has a smaller AlNiCo magnet (but still good sized), usually 16 ohm, although I've heard tell of 8 ohm ones as well. The SP-12C has a 22 ounce ceramic magnet and is 8 ohms with a Qts around 0.45. I suspect you have SP-12B's, as the specs I have for them have a Qts of 0.7, about what yours have. They came in both cast frames and heavy pressed frames. The plain SP-12 is very suitable for horn use, while the SP-12B and C models had bass reflex in mind. The SP-12B should sound very good on OB with a big baffle. For a smaller baffle, a pair of very high Q LS-12's would be in order. They have a Qts of around 1.5 or so, but aren't quite as efficient.You might find more info here.
http://www.geocities.com/tadgesualdo/index.html
Dave 
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