Thanks for the link. I think I will be getting that adapter. Why do you reccommend that I keep them together (side by side).
I just thought about the speaker terminals. Would I be able to use speaker wire to connect them as well?
If I am correct. Keeping them side, by side they act as one subwoofer, and give more out-put.
Separating the subs in different location in the room is good for smoother frequency response with the room modes. This is also harder to get right.
With proper placement, and calibration a single subwoofer or 2 subs together can give excellent performance.
I also don't recommend you use 2 different subwoofers. JMO
As far as speaker wire for subs. I don't think so. RG6 75 ohm is good to use, and cheap.