questionsi need a boom box of a small mp3 shelf unit…

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I have a Sony RDPX500IP Speaker Dock. Bought this item off Woot for $99 a few months back. I love it. I have no clue what your price range is but I'm sure you can find something similar.

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Buy a pair of powered computer speakers with a small subwoofer and connect by 3.5mm headphone plug. If your Mp3 player has Bluetooth buy a small usb powered Bluetooth receiver and hook that up to the powered speakers by the 3.5mm plug then use Bluetooth to connect.