It has come to our attention that very occasionally one channel of the 851N doesn’t output any sound. After investigation, it appears that the DACs do not always boot properly as we load the software into them. Unfortunately, there doesn’t appear to be anything that we can do about this - our software configuration is correct, but it appears that the Analogue Devices DACs don’t always accept the load sequence. It’s a rare occurrence and can be recovered by simply powering the unit off and on again.
If the power button is cycled on/off very quickly this can also crash the DACs whilst they are booting, causing a failure on both channels. Please turn the unit off and then on again to resolve this.