You may hijack the thread all you want. Consider it like a commercial break.
I never like the idea of modifying a current speaker unless you are a speaker designer/builder yourself like Denise Murphy.
For most of us, I think it's best to just buy new speakers because it is usually about the overall design, not just the one driver or the crossover.
I believe the guys here have pretty much nailed the Separates vs AVR question - it just depends on your current priority and personal experience/comfort level.
I've had years of experience with the Denon 3000 series vs 4000 vs 5000 vs AVP-A1 + ATI amps, as well as other separates from Bryston, Acurus, Classe, Mark Levinson, McIntosh, NAD, Anthem.
Speakers/Subwoofers and room acoustics seem to be salient to me, not Separates vs AVR.
Currently I do use separates in my main system (Denon AVP-A1HDCI + ATI AT3005 and AT2005). But I will say that I would be very comfortable and happy with the sound quality if the Pre-pro were substituted with a Denon X3000 series.
Since I am 100% happy with the sound quality of my system, these days it's all about the music, movies, and TV shows.
So my priority has shifted from auditioning/buying audio components to just enjoying the music, movies, and TV shows.
Priority and comfort level are the 2 main factors to me.