https://techcrunch.com/2018/12/12/review-amazon-echo-input-is-the-easiest-way-to-stream-media-to-speakers/

This is the Echo I’ve been waiting for.

Throughout my house, I have Amazon Echo Dots connected to stereo systems. In my office, I have a Dot connected to an Onkyo receiver and amp. In my basement, I have one hooked up to a small bookshelf system. Outside on the deck, a Dot serves audio to a small amp that powers outside speakers. There’s more, but the point is made. The Dot is a great device to add voice services to existing speakers. But with its built-in speaker, I’m paying for features I’m not using.