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why?
I have a Harmon Kardon factory system with subwoofer and it is quite good even compared to my other mega full custom system
All you may want to do is add a separate real sub and amp.

Another option would be for you to open the amp and tap low level outputs before the PA modules. That way you can run separate amp systems. I did that to my C240 HU. works nicely thru my JBL MS8
 

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40dB seems.. um unusual... How did you measure this? in car with a sound level meter? RTA? Very odd indeed...to the point of being unbelievable.

as for the 3 way active...you wanted to combine them to get a full range channel?
yes I can see this being difficult.

But again.... Infinity, JBL, Harman Kardon. All the same company. If they are using technology similar to the JBL MS8 then you have a great system.

Back to the HK system in my Mercedes R class. It sounds very very good. especially with the Logic 7 surround. Do you have a center speaker?
I have been toying with the idea of adding to it. My first concern would be if it is equalized. I would have to do a frequency response test from AUX in (or test tones on a cd) to the amp speaker outputs.
If there is equalization I would have to judge what it is correcting for. Driver response or cabin response. What about time alignment? I would have to consider this before upgrading speakers. Also I am not sure if the front mid/tweets are active or passive. The car wiring diagram is unclear on that. The frequency response test would determine this too.
The next question is adding power amps. Do I use line level outputs or do I try to hack into the amp to get to low level signals as I did on my MB C240 Head unit. I have that as a document if you wish. I posted it here a few years ago.

I can appreciate the effort you are going thru! Have fun!
 

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Would love to see your build log... but where is it?
 
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