Reverb time is adjusted at Symphony Hall to suit the performance.
The Reverberation Chamber contains a volume approximately 50% of the Hall itself. The reverberation time of the Hall is affected by a series of pneumatically operated doors above and around the Hall which open into this chamber.
On other lower wall areas there are manually operated acoustically absorbent panels against the walls.
I've attended many performances there and never had any niggling doubts about the reverb time.
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