One of the characteristics of the Emerson Quartet is that its players (the violinists Eugene Drucker and Philip Setzer and the violist Lawrence Dutton in addition, now, to Mr. Watkins) all have the ability and the instruments to produce a sweet and glossy sound — but do so sparingly. Instead, they establish a chromatic scale of timbres that range from dry and tart over clean and zesty all the way to lustrous and singing. Listening to them pass tiny rhythmic motifs around the group, I was struck by how evenly calibrated these timbres were.

Let’s make one thing perfectly clear: The “old” Emerson String Quartet never phoned one in. But this new group — Mr. Watkins alongside the violinists Eugene Drucker and Philip Setzer, and the violist Lawrence Dutton — complemented their customary power, finesse and unanimity with a fresh, palpable vigor at Tully, and it was electrifying.