I have tried this experiment both ways and to my ears having the Sonos drive my amps was merely adequate. The best I can say is that the Sonos produced background music, nothing I could sit with and get fully engaged. To me the sound was thin, gritty, and 1 dimensional if that makes sense. There was no texture and depth. Running it through a DAC helped a lot. I intend to also add the Empirical Audio Synchro Mesh to help reduce jitter. I love the Sonos interface and ease of use though.
Sonos to Amp - is simplicity better?
I'm curious if adding a dac and preamp into the path between a Sonos and amp will improve the sound?