The Echo dot can be connected to anything, even a Bose. You need a rca cable with a 3.5 jack. So it looks like the end of a corded headset /earphone that plugs into a radio, ipod, phone ETC on one end while the other end is a red and white rca plugs that plug into the back of a stereo/ Bose/amp...That's what the AUX setting is for. Alexa is Bluetooth only while the Dot can use bluetooth and/or the external jack to plug directly into a speaker/Stereo. Alexa is made as a good sounding stand alone speaker for music while the dot is made to use with external music sources and listening to music on it sounds like a old AM/FM portable radio even just using it for the voice part is ok by itself! I have my Dot connected to a 1979 vintage stereo and 1975 speakers that are worth about $2000 and it makes it so simple to listen to any music from Amazon, Spotify, Pandora or TuneinRadio! Well worth the $30 Ipaid for it!