What in your mind represents real technological advancement.

Lower distortion.

Loudspeakers often distort hundreds if not thousands of times more than the rest of the audio chain put together. 

They can suffer from box distortion and / or breakup distortion. In a perfect world one driver could effortlessly cover the entire 20 Hz - 20 kHz. And the cone/ driver material would be infinitely strong and weigh next to nothing.

We really need another Ed Villchur type breakthrough like the one back in 1954. 

 https://en.m.wikipedia.org/wiki/Edgar_Villchur

Or failing that, perhaps some form of Digital Signal Processing trickery can help make the sonic illusion feel more real. I can't help but notice that live coverage of a Formula 1 race on television now looks remarkably similar to that of a PlayStation 4 game!

At some point on the road to virtual reality they might even become indistinguishable. 

Getting getting rid of the very deleterious stray laser light that makes CDs sound thin, irritating, congealed, generic, smoothed over, rolled off, synthetic, compressed, zippy, unmusical, boring, digital, bass shy, bloated, two dimensional and like paper mache.

You don't need to change the speaker. Use my Schroeder Method of Interconnect Placement and hear for the first time what a speaker can sound like if the link hasn't been screwed up by an industry using a poor link (single IC) for decades. 

See the thread on the Cable forum that bears my name, and read my articles at Dagogo.com; the first is the Audio Blast: Schroeder Method of Interconnect Placement, and the second is a brief review of the Audio Sensibility Y cables. The Schroeder Method is a do at your own risk activity, though no harm has come to equipment to date, and perhaps there never will be. But, it is not yet vetted for all systems (Concern has been voiced by some over use with class D amps). If you have a concern check with your manufacturers. 

I am not interested in answering questions from people who have not done their homework. Please read the articles and posts on the thread before contacting me. I believe all pertinent info will be provided. 

Imo, the Schroeder Method is far beyond most suggestions you will have presented on this thread. It has the capacity to transform the performance of practically any passive speaker (active speakers will lose out on this, as they eschew external links; too bad, because they could be improved dramatically). 

I have no interest in arguing my recommendation. 

a way to block one way transmissions of advertising......

Reduction of breakups in loudspeaker drivers has been one advancement of the technology in the last 20-30 years. This makes a driver smoother and more detailed as there is less distortion.