The idea of a concert for “string quartet plus one” is an excellent one, but it does perforce move the quartet out of the spotlight. So let me say up front that the Dover Quartet (violinists Joel Link and Bryan Lee, violist Julianne Lee and cellist Camden Shaw) performed with utmost musicality and precision, not to mention stamina, through nearly 90 minutes of well-chosen, engaging recent music on the Chamber Music Society of Lincoln Center’s Sonic Spectrum IV at the Rose Studio. The soloists (percussionist Ian David Rosenbaum, clarinetist Romie de Buise-Langlois and harpist Bridget Kibbey) were likewise excellent, all three performing with commitment and intelligence.