Amazon abilities but with digital output... Sonos?

I want something that operates like Alexa but plays on my big system without having to hit buttons etc..  I'm going to use this in a private gym.  My clients often come in alone. I want them to be able to walk in, tell Alexa (or whoever) to play Simon & Garfunkle and it plays on the main system.

All Alexa devices only have analog outs..  Thoughts? Ideas?