What about the inexplicable (or simply not explicked) advances from people like Ted Denny and Tim Mrock? Read the breathless endorsements and accolades from the faithful followers of these obvious geniuses and you can see that a mere fuse, piles of "special" tiny aluminum dots possibly bombarded by quantum mojo, magnetic pads, or a $5,000 fuse box enhancer will simply make your rig transform into something you barely are worthy of owning. Nano things...carcinogenic graphene paste...directional fuses...are there still some people out there who question this stuff as illogical marketing scams preying on the sadly gullible? For shame!
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.