When it comes to portable Bluetooth speakers, the Ultimate Ears BOOM ($199) and MEGABOOM ($299) stand above the rest in my opinion. Each speaker has outstanding sound quality for its size, they're both incredibly robust, and Ultimate Ears backs them with an unprecedented two-year warranty.

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They both also have a killer feature called Double Up that allows two speakers - either two BOOMs, two MEGABOOMs, or a combination of either - to be paired together for stereo sound using the Ultimate Ears apps.

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