V1896. PAUL KNÜPFER, Vol. II: Songs by Rehfeld & Hiller; Arias, Duets & Ensembles (w.Max Kuttner, Hermann Jadlowker, Fritz Koerfer, Rudolf Krasa, Elisabeth von Endert, Margarethe Ober, Kurt Sommer, Therese Rothauser, Jacques Urlus, Melanie Kurt, Barbara Kemp, Karl Jörn, Hermann Wiedemann, etc.) from Der Rosenkavalier, Parsifal, Lohengrin, Das Rheingold, Fidelio, Aïda, Martha & Faust. (Germany) Truesound Transfers 3093, recorded 1912-14. Transfers by Christian Zwarg.
"Paul Knüpfer spent most of his career at the Berlin Imperial Opera where he was a noted buffo bass. He sang Baron Ochs in the Berlin premiere of Der Rosenkavalier. He often performed with his wife, soprano Maria Knüpfer-Egli."
- Ned Ludd
“[Truesound] transfers have been an absolute revelation to me….Amazingly, Christian Zwarg has managed to unlock the sound of these recordings in such a way as to present [voices] such as I have never heard before. Here the sound has a sheen and glow which is quite beautiful. It is as if an old masterpiece painting has been cleaned and restored, allowing rays of brilliant light to emerge….”
- Davyd Booth, THE RECORD COLLECTOR, 2012