ORLANDO, Fla. — “Hello everybody!” James L. Dolan shouted into the microphone in front of about 100 people who had arrived early at the Amway Center for an Eagles concert.

Most of the crowd had never heard of the opening band, J D & The Straight Shot, so Dolan introduced the group. “We’re a band from New York City,” he said.

That much was true. But what Dolan did not mention was that, in addition to being the band’s rumble-voiced lead singer, he is the president and chief executive of Cablevision, and the owner of the Knicks.

As Dolan’s band performed here on Saturday, a night after performing at the American Airlines Arena in Miami, his basketball team, the second-most expensive in the league, was in the midst of another dispiriting loss. The Knicks are a shambling, desultory group these days, stumbling through an opening month that has been worse than even pessimistic fans feared.