Having heard several variants on plasma and ion speakers back in the very early days of HP's Absolute Sound evaluations (back when the "magazine" was little more than a dozen pages, stapled and folded). I'd have to say that they reign supreme; however, they have never been practical commercially.
Of those designs that have survived as commercial products, electrostats (martinlogan, dayton-wright, others) and magnetic ribbons (Heil, Magnepan - different, yet similar in principle) are probably the best.
I fell in love with the original CLS speakers playing string quartets when I first heard them. And, I owned a pair of Monolith III's that I bi-amped using the Dahlquist DQ-LP1 active crossover.
Of those designs that have survived as commercial products, electrostats (martinlogan, dayton-wright, others) and magnetic ribbons (Heil, Magnepan - different, yet similar in principle) are probably the best.
I fell in love with the original CLS speakers playing string quartets when I first heard them. And, I owned a pair of Monolith III's that I bi-amped using the Dahlquist DQ-LP1 active crossover.