From the Philadelphia Inquirer - since Phildanco uses this hall, too, this might affect that company:
<B>Acoustical doors at last tested
Ninety of 100 on the hall's second and third tiers were opened. The result was hard to judge.</B>
Finally: The doors to the acoustical resonating chambers at Verizon Hall that we've heard so much about were opened Sunday, and opened wide - 90 of them out of 100.
Ten weeks after the opening of the Kimmel Center for the Performing Arts, the software needed to operate the doors was functional, which inspired acoustician Russell Johnson and his team to open 90 doors on the second and third tiers of the cello-shaped hall. That added a relatively short but loud reverberation to the sound of the Symphony Orchestra of the Curtis Institute of Music.