Can I add a DAC to new Sonos Amp?

Yes Jog on - I haven’t got 7 years playing internet tennis with you or your chums - im not interested in your thoughts on snake oil ideologies 

KB29R,

You can plug any DAC output into the analog inputs to AMP, even 576kHz if you can find a DAC that supports this bit rate, but it will be difficult to find 576kHz source material at this point in time.

Most flat earthers avoid discussing any concept of a spherical earth too.  Can't say I blame them.

On the flat earth thing - I recently discovered that this is still a fervently held belief in THIS century including explanations/rebuttals for all the reasons supplied to establish that the earth is a not a flat disc. 

576?? Just the odd recordings from quobuz 24/192 would be nice - including Tidals MQA... the dac in question is this:   https://www.whathifi.com/reviews/ifi-zen-dac

I would like to consider another aspect of this question.  Is this method being used to play music files stored on the Mac? If so, why? Rather than set up a Sonos music library?

SONOS is a music playing system, not a music storage system. SONOS will play music stored on a PC, Mac, an external hard drive, dozens of online music services, Airplay 2, and music stored on an Android. For music files stored on a PC, Mac, or external hard drive (Known as a NAS [Network Attached Storage]) SONOS builds a music library index that is stored on the SONOS players. Storing the index on SONOS players improves system features and response time as the system operator requests play.

Of course, if files are stored on a PC or Mac, one is limited to the bit rates supported by the SONOS hardware. Similar for the online music services. If you believe that bit rates higher than 44.1Kbps are better, then storing the high bit rate file on the PC or Mac and using an external DAC is a better approach.

By the way, 576 is used in some studios for their recordings. The really, really serious Purist should seek these, but I have not seen any of these files in commercial distribution.

Much like wine testing events, the elite are not willing to accept the outcome when the boxed wine in a fancy glass wins the contest, the audio elite will always consider 44.1 less than worthy, even when they cannot figure out which glass has 192 or which glass has 44.1 simply by listening.

I have Hi Res files stored on my Mac and Subscribe to Qobuz hence the external Dac question

Bizarrely Sonos have responded to me refusing to specify what the line in’s maximum sample rate is...

Perhaps that’s because, as we’ve been reiterating, the Line-In interface doesn’t have a sample rate. It’s analog.

Once again, internally Sonos digitises Line-In into 16/44 WAV (for Uncompressed Line-In operation). Some newer devices may use 16/48 WAV instead, but in any event the ADC sample rate won’t exceed 48kHz.

https://support.sonos.com/s/article/79

https://support.sonos.com/s/article/4839

Those links are not specific in regards to the Line Ins and if the line in didn’t have a sample rate then why would Sonos say that they are unwilling to provide that information to the public?