Echo Sub review: All about that bass and we're delighted

Echo Sub review: A well-priced and powerful subwoofer for Alexa smart speakers, but this subwoofer works best with certain Echo models.
The Echo Sub adds bass to a range of Echo smart speakers

Echo Sub Review

Echo Sub Review: Alexa, Goes Boom!

Echo Sub review: Add some serious bass to your Echo or Echo Plus speakers

Klipsch R-80SWi 8-inch 150W Wireless Subwoofer with High Performance Driver for Deep Bass Black : Electronics

Echo Sub Review: Alexa, Goes Boom!

Echo Sub Review: An Affordable Subwoofer for Compatible Echo Devices

Echo Sub review: Add some serious bass to your Echo or Echo Plus speakers

Echo Sub Review

Echo Sub delivers down-firing, 100W deep bass sound through a 6′′ woofer. Pair with one Echo or Echo Plus (sold separately) to enjoy dynamic music that fills the room. Pair with two of the same Echo devices for rich left/right stereo sound. Simple to set up and use—just plug in, open the Alexa app, and wirelessly connect to your Echo device(s) to control music with your voice.

Echo Sub 100W Subwoofer - Charcoal

Echo Sub Review: Alexa, Goes Boom!

Echo Sub review: Echo can finally go deep - CNET

Echo (Gen 2) Review: Best Overall Smart Speaker