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I would like to use my Eras 100 as a speaker for my Mac Studio.

Since I want to avoid delays, I would like to use the line-in on the ERAS 100. Bought a USB-C to 3.5mm adaptor from Apple, but it’s not working.

Do I need the SONOS dongle absolutely? Is there something unique about the SONOS version?  I don’t think the Mac Studio has a “pre-amp” but I am not sure. Will it work once I have the proper dongle or I will be limited by my Mac Studio output capacity?

Yes, you would need the Sonos dongle. No, it would not eliminate the delay on the line in. 
 

Sonos doesn’t make or market itself as computer speakers. You can force certain items into that use, see here, but in general, using Sonos is not recommended for that purpose.