In this choral prelude Kauffmann again prescriobes the use of the QWuintadena 16′. Together with the Preastant 8′ it forms an interesting combination I would never have thought of myself. Perhaps Kauffmann meant the piece to be played an octave higher than notated. But I choose to play it as notated, with the registration as indicated.
BW: Quintadena 16′, Octaaf 8′
HW: Praestant 8′
Score available here: http://partitura.org/index.php/georg-friedrich-kauffmann-schonster-immanuel/