Amazon leak reveals upcoming Echo subwoofer and smart plug

Amazon appears to have leaked some upcoming products on its UK website. Pocket-lint spotted listings for two new Alexa items, a smart plug and a subwoofer, that appear to be going on sale soon.
The subwoofer is by far the more interesting of the two. It’s called the Echo Sub, and it can work in conjunction with one or two other Echos to improve their sound quality. If you put two Echos in a room with the Echo Sub, the leaked listing says you’ll even be able to turn them into a 2.1 s