Hahahahaha. I had this idea on measuring accuracy. Do this at a slower frequency. This way we can see the steps clearer. 200Hz. Again -72db. 16 steps. For a 16 bit ladder, this means bits 12,13,14, and 15 (with 0 as the first bit). AGD Singularity 19 Modi 2 (SD) Modi Multibit (Modi Multibit) Comments: The S19 steps are all over the place. Some steps are slightly larger than others, some smaller. There is a lot of noise or small glitches. Note that the differences in gap size are consistent on each wave, as would be expected with a ladder DAC. Modi Multibit seems to have the most consistent steps and best triangle shape. However, there is a glitch at zero crossing. Maybe something to do with flipping 1111111111111111 to 0000000000000000. The worse case scenario because all bits are being flipped at once. I think it's funny John Atkinson of Stereophile thinks the similar zero crossing glitches on the Yggdrasil is the result of using 20bit chips instead of 24 bit. I could be wrong here in what I am thinking, but JA is most certainly wrong. Number of bits was nothing do with with the zero crossing glitch. It's obvious John Atkinson is too obsessed with DACs needing to be 24 bit. There is a little bit of bowing on the triangle wave with the Modi 2 4490. S19 has his bowing too, but it's lesser and harder to see. I am surprised that the Modi 2 SD DAC is less accurate than the pure 16 bit Analog Devices part. Looks like @baldr wasn't full of shit after all. One easy way to tell is the up-wave isn't symmetric with the down-wave on the Modi 2 SD. Also, after each peak, the first few steps seem stretched out in the Y-axis, and the last few get squished in just before the peak. I wonder: is the SD wave less accurate because of the digital filter math approximations, or because SD conversion, at least for this chip, is less accurate? Or both?