Violist Geraldine Walther made the sumptuous most of her lyrical lines and one was struck by the fullness of the group sound, taking advantage of an extended stage.
The all-pervading restlessness of Janacek's 1928 quartet, Intimate Letters, comes from its mix of folkish outbursts and soulful reflection (Walther at her considerable best in the Adagio).
It catches the emotional fluctuations of the composer's ill-fated romantic crush on an unattainable love, inspiring dialogues even more potent when taken on by these four extraordinary musicians.
After interval, Ravel's 1904 String Quartet did not conceal its emotions behind a veneer of Gallic elegance.
There was passion in the undulating Allegro with heart-stopping moments when Dusinberre's violin took to ethereal heights against shivery tremolo.
Shading dropped to pianissimo and beyond, memorably in the closing bars of the slow movement; before that, a very deliberately paced Scherzo dealt out some almost Bartokian boisterousness.
Cellist Andras Fejer revealed later that Borodin's Nocturne would not have been his choice of encore.
Yet one would not have guessed from his glorious lyricism in the piece while, around him, the group created a delicate thread of whispered conversations.
Another superb offering from Chamber Music New Zealand and, thanks to Radio New Zealand Concert, one that can be enjoyed again on air next Monday evening.