https://techcrunch.com/2019/04/10/review-the-299-echo-link-amp-is-the-easist-way-to-add-alexa-to-any-speaker/

The Echo Link Amp is designed to give Echo owners options. Instead of settling for the sound from a couple of Echo speakers, this amp lets owners use a set of nice bookshelf speakers. Best yet, this replaces a large receiver generally needed to power speakers.

At $299 the Echo Link Amp lives in a curious spot. It’s less expensive and smaller than a traditional home audio system. Yet it’s more expensive than smaller desktop amps with a similar power rating.