Interesting. The upsamping in the Simaudio 650D is non-defeatable - I believe it's integrated into the Sabre chip set.
Defeating the Meridian upsampling/apodising filter on the Meridian MS600 leads to more high frequency presence, both through the Simaudio and the dac built into the Meridian MS600. It also reduces bass presence, particularly through the Meridian dac.
For some reason, with the Meridian upsampling filter engaged, there is a dip in the mid-bass when using the Simaudio dac. I wonder if this is due to some sort of interaction between the Meridian and Simaudio filtering process?
The Simaudio dac does present the sound differently than the Meridian dac regardless of setting, though. It tends to add a greater sense of depth to the recording, perhaps by de-emphasising the mid-range a tad and through greater decay. It also has more pin-point imaging and focus. The Meridian dac is more "direct", "solid" or "forward" sounding. Frequency wise, it can sound more realistic and fluid at the expense of imaging, a sense of 3D space and air.
Defeating the Meridian upsampling/apodising filter on the Meridian MS600 leads to more high frequency presence, both through the Simaudio and the dac built into the Meridian MS600. It also reduces bass presence, particularly through the Meridian dac.
For some reason, with the Meridian upsampling filter engaged, there is a dip in the mid-bass when using the Simaudio dac. I wonder if this is due to some sort of interaction between the Meridian and Simaudio filtering process?
The Simaudio dac does present the sound differently than the Meridian dac regardless of setting, though. It tends to add a greater sense of depth to the recording, perhaps by de-emphasising the mid-range a tad and through greater decay. It also has more pin-point imaging and focus. The Meridian dac is more "direct", "solid" or "forward" sounding. Frequency wise, it can sound more realistic and fluid at the expense of imaging, a sense of 3D space and air.