If I was you I would put both wires from the voice coils onto the one connector that is already on the box. That would give you a 2 ohm load. Buy an amp that is 2 or 1 ohm stable bridged to one channel. That should rock your little audiobahn sub.
Here's one......
http://www.thezeb.com/p-Audiobahn-A8000T-M...fier-100152.htm
http://www.acaraudio.com/product_info.php?...roducts_id=1480
or you could put in another connector on the box which would give you 4 ohms per channel and get a big 2 channel.
http://www.acaraudio.com/product_info.php?...products_id=641
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewI...5749448459&rd=1
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewI...5749560587&rd=1