JL Audio Fathom

If you haven't already, perform the subwoofer crawl and map your rooms two loudest standing wave bass modes. Position the ML 1100X's in those modes then recalibrating them. Despite the level of noticeable improvement at least you'll know that rooms optimum sub locations, forever.

The cost of custom length subwoofer interconnects from say, Blue Jeans or Monoprice Cable are quite economical. Try and maintain the same VAC supply to avoid grounding issues.

A -6dB  'Sub-Bass' speaker is not a subwoofer regardless of where its manufactured.  

I have 3 F112 v1, since 2008 iirc, I’ve also had need to have them serviced, keeping my boxes shipping them to either AZ or FL. The service is excellent and timely: about 7-10 turn around. The fact that they can be serviced is a plus. That they are still in business even with some negative feelings by a few says a lot about them as a company. The good news is they are stunning, powerful, fast and adjustable in every manner. I don’t use the ARO room correction but let my Trinnov deal with it. My system is a dual purpose room, both analog and HT. I play vinyl and digital music plus movies. Getting 3 subs in phase with the mains is challenging, I’ve done it manually in the past, but not much need now. I don’t think you’d go wrong getting the F112. 

I also have owned dual JL Audio f 113’s v2 for about 7 years. They unfortunately both needed servicing, and one of the units, had to be serviced a second time. However, to their credit, they ended up replacing it with a brand new unit about a year ago. Customer service is excellent. It has been all good since then, and they sound wonderful.

I'm surprised by all the servicing needs. For the price, I would expect more reliability. 

I have owned two F112V2's for close to six years now and have never had an issue with either one. (I hope I do not come to regret that statement) Could be the, law of averages at play here...the more units you have in the market, the more that could end up needing service.