They are DVC 4 ohm subs with 10 gauge speaker wire. I ran the voice coils parallel to get 1 ohm. I have a 5 channel amp with a 1 ohm stable mono channel.
I didn't use either of the diagrams in the manual because they wouldn't fit where I needed them to. I built a sealed box to hold both of them with 1.47 cubic feet of air space.
Here's a link to the pics
http://invision.aleromod.com/index.php?showtopic=5564
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