The Sonos is notoriously high in jitter, so adding a reclocker to this is recommended. I use a ZP-90 with Synchro-Mesh reclocker.
An external DAC can have a lot of advantages because of the separate power system from the transport and more space to do better power delivery. The quality is however still linked to the amount of jitter from the transport. Most DACs are not capable of reducing this much. Be prepared to spend some cash, at least $500 on a good S/PDIF cable to make the DAC effective.
Steve N.
Empirical Audio
An external DAC can have a lot of advantages because of the separate power system from the transport and more space to do better power delivery. The quality is however still linked to the amount of jitter from the transport. Most DACs are not capable of reducing this much. Be prepared to spend some cash, at least $500 on a good S/PDIF cable to make the DAC effective.
Steve N.
Empirical Audio