Review and Measurements of SMSL VMV D1 DAC
OK, the new board arrived today and spent some time replacing the old one with it. The work was fairly involved with some 30+ screws and desoldering/soldering the power supply wires. But it is done.
If you all recall, the problem was with unbalanced output using 192 kHz where we had a set of distortion components that were there with or without signal:
That caused the SINAD to drop by some 20 dB.
The new board nicely remedies that:
Note that the above is with 90 kHz of bandwidth (to go with 192 kHz sampling). At 44.1 kHz, SIAND climbs to 114.5 average as reported in the original review.
I also ran the jitter test since unbalanced performance was not as good as balanced: