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It is very good that you put your midbasd chenal behind you listening position. If they are time line then it is at very very cool solution. It gives a very interesting and very beneficial space confusion. And in this case confusion is a very good thing. 

Regarding your new subwoofer I feel it will be a battle. I do not thing it will be difficult to integrate it but to make it to sound together where's the rest of the system will be difficult. My prediction is that you will get very good result from your infra low frequency channel, and you will be able to get this last sub octave but with time you might feel that it certainly resolve objective to be ultra low frequency channel but in the same time it will damage the quality of your normal base. Your line array pass channels supposed to have own softness which is very very difficult to match with a simple solution you are going for.

 I have been using for years my secretive tool of bass research. This Sunfire True subwoofer. It is cubic feet little box with 2 barbaric long excursion rubber drivers and a few kilowatts amplifier. It has a crossover abort down to 30 HZ and precise phase dial. This little shop is a spectacular tool to learn about room response and to add virtually to any system to learn about effect of intra low frequency response. However, anything beyond pure well formulated experiment in my view should not be done with this unit. Musically it is absolutely revolting bass and it should not be used for a normal listening.  I think there's a blue photos that you build "might" and the top to be the same. I hope it will not be happening but in my estimation is very high probabilities that it will happen. 

Building ultra low frequency transducer is in the way similar to discovery of quantum mechanics, where everything is fucked up but works. The bigger sing that in my view need to be understood that we are not talking about frequencies anymore. We are not introducing literally bass but we are introducing kind of other Force in the room that cannot be described by crossover points or anything else. Whatever your ultra low frequency channel do should not be auditable and ironically it should not be felt. That contribution of your ultra low frequency channel should be observed only through the performance of your other channels. This is very simple rule but it takes a person yes to actually get it. We all have expectations from our ULF and we built something to fulfill those expectations. All the time sayings that our expectations in my view are incorrect and it takes time to modify those expectations and recognize what we are truly need. 

A few months ago I met a statement in one on my videos bass channels should not be driven by the same crossoveed signal as a rest of the system.  In my view it is the key. In my current view it needs to be very deliberately "distorted" in order ULF do not destroy your existing low frequency sound. You might discover this time that it is a correct direction to go.

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