I measured the Questyle Audio QP1R with my Audio Precision SYS2722 system (see the January 2008 As We See It."). Source materials were WAV and AIFF test-tone files, as well as DSD64 and DSD128 files of test tones prepared for me by Malcolm Hawksford. The QP1R's battery was fully charged at the start of the testing, and the player's firmware at the time of testing was the original combination of HW v.3.0 and SW v.0.07 Beta. The Line output was set to Fixed, and I looked at the QP1R's performance via both its Line and Headphone outputs.
The volume control…