“Six and a half years after opening night, more than $300 million later, Philadelphia didn’t get what it was promised. At least the Kimmel’s current leaders are now acknowledging failure, even if they carefully avoid the word. That’s progress. For years after opening night, top Kimmel and orchestra officials sneered at critics who said Verizon’s sound varied in quality from seat to seat, or that the sound in general didn’t have enough presence or impact.”