What in your mind represents real technological advancement.


To be a real advancement the technology must improve the sound quality. Just extending the bass or the high end can't be call an advancement if it doesn't sound better. If the bass goes " lower " but is muddy or the highs go higher but are " bright and forward and irritating " then that does not improve the listening experience. So the question is what improvements make a speaker more enjoyable to listen to. 
128x128soundsrealaudio
Definitely DSP. Room Perfect, as just mentioned with Lyngdorf, Anthem Room Correction, Dirac. To be done well, room correction often takes a lot of processing power. We're already starting to see the big tech companies (Google/Amazon) incorporate DSP into their cheap speakers. The Google Home Max has this. As time moves on, I suspect this will become the next frontier for better sound for audiophiles AND the masses. It's often said the elephant in the room IS the room. I bet/hope we will all soon have the benefit of Google's cloud servers crunching out the numbers for us and applying DSP room correction.
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Modern hearing aids combined with testing and the ability to help 5-15% of the human population with hearing deficiency. Of course, most audiophiles here might not want to admit they have this dreaded physical impairment.
Soundsreal I was not harsh just 180 out of phase with one way broadcasters....

speaking of driver breakup, I could not agree more with Ralph, we are just now getting affordable ( if $50k of capital investment is affordable for small speaker manufacturers? ) laser scanning tools to show driver out of phase behavior, which is 100% trash