Another prime example are my original Acoustic Energy AE1‘s, which are notoriously inefficient, but were designed specifically to combat thermal compression, having their voice coils thermally bonded to the aluminium speaker cones to dissipate heat.
They sound atrocious cold, and really need a bit of warming up before they begin to sound good; sounding better the harder you drive them. They love heat. Their lack of compression at high levels is quite astonishing, even today, and makes nonsense of the idea that thermal compression has to be a limiting factor in low efficiency speakers. Their ultimate performance is mainly constrained by the driving amplifier.
They sound atrocious cold, and really need a bit of warming up before they begin to sound good; sounding better the harder you drive them. They love heat. Their lack of compression at high levels is quite astonishing, even today, and makes nonsense of the idea that thermal compression has to be a limiting factor in low efficiency speakers. Their ultimate performance is mainly constrained by the driving amplifier.