I didn't try to ABX the original with the others, because they involve a DAC and an ADC in addition to the heaphone amplifier. The original is level-matched, though, and time-aligned too. The top graph shows that the playback and record system quality is good. The fact that the sample rate is not the same is the main difference, because when you listen to the samples, there must be a short delay for the DAC to switch between the sample rates. Unless you have a soundacrd that resamples on-the-fly. In this case, the quality of the resampling can be questionned. If you are using Foobar, load an SRC DSP, set on 44.1 or 48 kHz, and see if the difference is still there (if you want to try the ABX again, you must check a box for the DSP to be loaded in the ABX module). Edit : I can't record at 44.1 kHz with my deck, and I wanted to use the deck as ADC in order to avoid any clipping.