The echo is from the concrete benches. They’re leaving these in place. Not tocuhcing them, not putting anything between them and the center of the circle. Intuitively, it should not change the echo if you don’t put anything between you and the echo. Empirically, sound engineers said it will work.
I don’t know what else to tell you. It is falling apart. They have to fix it. The plan is sound. (Hehe)
Empirically, introducing an absorptive or reflective surface, like the "Signature Shade Structure" could have the effect of unbalancing the noise-canceling phenomena. Think common-mode cancellation where a signal of equal amplitude but opposite phase is used to flatten a waveform, and then change one of the parameters and it breaks down. Im really hoping a sound engineer took that into account, because the bridge does need repair and doing nothing could b just as bad if not worse.
Im not concerned about the needed repair, its the addition of cosmetic frills that worries me.