You don't realy have to worry about ohms on that amp. It will displace the same wattage at 1.5 ohms as it will at 4 ohm. Go to this link at JL tutorials. You want the option 3 DVC drivers with Voice Coils in Series / Parallel. It will give you between 3 and 4 ohm. You have to keep mentioning that amp. I think you do it to make me jealous. 
http://www.jlaudio.com/tutorials/wir...ex.html#3dvcsp
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