The biggest criticism of the Amazon Echo is that it doesn’t sound that good. It’s a criticism that needs qualifying, because we’ve never really thought of the Amazon Echo as a speaker for music. Rather, it’s all about its Alexa voice assistant.

With Google now offering a wider range of speakers – there’s Home and Home Max as its two majors – and Apple having its own crack with HomePod, Amazon has made what’s perhaps a surprise move with the Echo Sub: a companion to the Echo that’s solely there to boost bass and therefore overall sound quality.
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https://www.pocket-lint.com/speakers/reviews/amazon/145822-amazon-echo-sub-review