With DSD128 or 2xDSD, there should be no noise below 40 kHz, so a higher low pass filter is desirable than with DSD64. If 30 kHz was too high for 1xDSD, isn't 50 kHz too high for 2xDSD (I think 30 kHz would be too low for 2xDSD)?.
I also think I would prefer this process to be automatic. If 24 kHz is preferable for 1xDSD, would 2xDSD not be better served with a 44 kHz filter? Couldn't MC not determine the best filter based on 1x or 2xDSD? Next to that I would also like to disable the low pass filter entirely so I can add my own preference in PEQ.
Another Q related to this. My Teac UD-501 has 4 selectable FIR filter settings:
FIR1: fc = 185kHz, gain = -6.6dB
FIR2: fc = 90kHz, gain = +0.3dB (default)
FIR3: fc = 85kHz, gain = -1.5dB
FIR4: fc = 94kHz, gain = -3.3dB
When I bitstream DSD, I would bypass the low pass filter in MC, but these FIR filters are much higher. Wouldn't that potentially allow noise to come through and isn't that undesirable? When you look at
this image, it looks like a considerable amount of noise is allowed through. What am I to make of this?
When I'm not bitstreaming, apart from the gain difference, these FIR settings aren't doing anything due to the filter in MC, is that correct?
Thanks!