These speakers need an "opposite" ("-" inside; "+" outside) power supply 15 V. Most power adaptors, (for example laptop adaptors) are "+" inside; "-" outside. They can not be used! So, I think, You need an universal power adaptor, which has a cord with invertible plug, and voltage 15 V. I hope a 1000mA (max power) maybe the best, but 500mA could be also satisfactory. (I have the same problem and seek for such an adaotor.) These remains for me a question now, if a 12 Volts adaptor would also work, as they are the most common universal adaptors.
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