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The PPI may or may not have balanced inputs, but it doesn't matter if you are getting a processor of some sort.
The audison bitone is popular but pricey. The MS-8 is hard to get internationally at present, and doesn't give you much to tweak with.
I would consider the bitone or Zapco DSP-6 if you can afford them, or the Rockford 360.2 or the Audio COntrol DSP EQ/Xover secondarily.
MB Quart is not made by the same people. That factory and staff now make German Maestro in Germany.
I would suggest the Morel Dotech or Hybrid Ovation 4, the Rainbow ProFi 4, the Helix H234, the DLS PS4, the the Rainbow Vanadium 4 (titanium tweeter you might like), and I hear Focal has two 4" sets that fit. You will need to make an adapter bracket for any of them.
The underseat is gonna be another fun bit. Morel, Rainbow, Earthquake, and a few others make some flat 8" that fit with more or less work.
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