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Good question, perhaps we will find out in 2020.
I always thought that plasma loudspeakers were the "most transparent", since the driver is mass-less.
Something like these old Hill Plasmatronic speakers -
Let's get sluggy
@groucho69 some great tunes with Sam Roberts. Love their sound.
Just what I happen to be listening to.
You might enjoy this
Weird video, love how they show the recording of the separate tracks underlying the song.