Amazon - Echo Sub 100W Subwoofer - Charcoal

115W maximum power; dual-layer mica woofer diaphragm; motion feedback technology; crossover; push-type phono input terminal

Echo Sub delivers down-firing, 100W deep bass sound through a 6" woofer. Pair with one Echo device 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. We want you to know - Echo Sub must be paired with a compatible Echo device. Echo Sub is optimized for Echo Studio, Echo Dot 4th Gen, Echo Dot 3rd Gen, Echo 4th Gen, Echo 3rd Gen, Echo 2nd Gen, Echo Show 10 3rd Gen, and Echo Plus 2nd Gen. Currently, stereo pairing, speaker groups, and multi-room music only support music playback over your wireless network, and do not support Bluetooth, 3.5mm AUX in, or TV/video connections. Some Echo devices support different stereo and subwoofer configurations.