With its size and price, the Nokia MD-12 hides his play. The device is very powerful, it must, however, keep it lay on a solid surface to obtain bases (which can shake the device). Starting is simple, several options like Bluetooth, NFC or a simple 3.5mm jack. The finish looks solid and the addition of a gripping surface under the machine is a plus.
Finally, if you find a small but powerful portable speaker without having to pay 200 (see bose) this one is for you and is compatible with any device (tested with Nokia Lumia 820 and iPhone 4S)