You seem to be leaning towards a different direction now - You can
buy the Klipsch if you want to. The Mirage sub, with 8" woofers had
limitations.
There is nothing wrong about loudness or high SPL - as long as it is
clean, tight and controlled. If you want reference level, then go for
it. The Pioneer speakers were not made for reference levels.
Nothing wrong with 2 subwoofers, if you really feel the need. > The
key with one sub, is to properly place it. If you want 2 then buy 2.
If budget permits - the Epik or this HSU sub, would be my preference.
VTF-2 MK4 Subwoofer