The Sony HT-AX7 is in a category of its own. It’s a portable Bluetooth-connected surround sound system, where you can just grab the two rechargeable mini ‘puck’ speakers from the top of the main unit, place them behind you, and be surrounded by movie audio. Or you can just place them around a room for more diffused music than from a single speaker, Sony says.The Sony HT-AX7 isn’t promising 5.1-channel sound or anything quite so simple. It’s processing your
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