power adapter requirements for Midiland Mli 691H speakers?

Skylar

New member
I bought these from the salvation army thrift store and didn't realize that they didn't have the power adapter. There is no rating or any form of print on the back where the power port is. The only thing that is listed is the name of the speakers on the front. I am also going to need to know the polarity for the plug.
 
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