Pictures of the rear are scarce, but I found one...
http://www.echoloft.com/cgi-bin/buysell2/YaBB.pl?board=ht&action=display&num=1224903798
I could find no articles or ads that mention anything non-standard about this speaker (like bi-amp capability, which it clearly has).
Tie the 2 minuses together; and the two plusses to each other and run your normal plus and minus to the plus and minus on the speaker.
Be advised the 4-ohm nominal impedance might be on the low side for your amp. Check its requirements.