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has taken the wraps off the Echo Sub, designed to supplement either a single or stereo pair of Echo speakers.
Echo Sub - Powerful subwoofer for your Echo - requires compatible Echo device : Devices & Accessories
Echo Sub review: Echo Sub is $130, turns Echos into a 2.1 system - CNET
Echo Plus 2.1 stereo system review
Echo Plus 2.1 stereo system review
Official: Echo Studio Glacier White with Echo Sub
Echo Sub - Powerful subwoofer for your Echo - requires compatible Echo device : Devices & Accessories
Echo Sub review: Echo can finally go deep - CNET
How Many Speakers Should You Have In Your Home Theater?
Echo Sub - Powerful subwoofer for your Echo - requires compatible Echo device : Devices & Accessories
Echo Sub review: Echo Sub is $130, turns Echos into a 2.1 system - CNET