Don't know if cabinet flexible is a desired goal but many speaker makers do not go to great lengths to tame any resonances and just incorporate them it into the overall frequency responce of the speaker.
Weight has little to do with it. My Tonians are a semi open baffle design and much like an instrument, absorb and dissipate the sound energy as quickly as an instrument. They excel at tone and timbre. They weigh (maybe) fifty pounds or so.
In the end, it's just one of many ways to skin a cat as I've heard some great speakers that I could hide behind in a gunfight.
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