Your setup works for you, and thats great. You are getting an increase in SPL, your frequency response is decent, and they meet your aesthetic requirement. My only intention was to point out that mutual coupling is not required to get the 5-6 dB increase in output from dual subs, especially since many people have a very poor response with a single sub, or mutually coupled dual subs. I think it is a disservice to the community for anyone to think they MUST mutually couple their subs in order to get the 5/6 dB increase, especially for those that have a poor FR with their subs set up in this manner. You can have your cake and eat it too.
I have to admit that you educated me on that. I thought that the further away they were that you would only get a coupling at the very lowest frequency is where the wavelength are further
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