Pairing of different JL Audio Subwoofers

@imhififan, this may be option. I hope there isn't too much degradation, at least nothing audible.
Any specific brand recommendation for this XLR to RCA adapter?

I've used Kubala-Sosna and Cardas adapters with satisfaction.  I've had variable results with the cheaper Hosa adapters.

Thanks kr4. After some sound boarding with you all, I think I will pull the trigger on getting the F112 after all. Time to search for this adapter. 

Thanks for everyone's input. I truly appreciate your experience and words of reason. 

This might be a problem as the F112 has a XLR output and the E112 does not accept XLR input. I would have to use the RCA output of the E112 to input it into the F112.

@chief_trojan  Jensen Transformers makes a transformer that is optimized for subs that will do the conversion from balanced to single-ended or the other way. It has bandwidth down to a fraction of a Hz so it won't interfere with bass impact. I'm using a pair of them in my system.

Another option with JL F series is to use one F series as the system master and daisy chain multiple and more economical E series. Refer to the F manual.
http://mediacdn.jlaudio.com/media/mfg/9013/media_document/live_1/f113_MAN.pdf

MonoPrice or Blue Jeans Cable for economical custom length interconnection cabling.