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You need to know what the wattage of the speakers are, polarity is generally standard.
There is a small formula too work out what the current rating is. This you can find on the internet.
Just search for Voltage , watts to amp converter.
Hope this helps
Looking up these speakers, it appears that they connect via a 3.5mm headphone jack. This type of interface does not require a hardware driver. Instead you need the driver for your sound card, download the driver from the website hosted by the manufacturer of your computer. please rate my solution
Not only do you need the correct voltage and amperage (MAH) but you need the corectly sized plug to fit the socket AND it has to be in the correct polarity. Usually the polarity is marked by a broken circle with a dot in the middle. Leading to this dot will be an arrow or just a line and at the other end of the line will be either A positive (+) or negative(-) It's important you get this polarity correct when plugging a new power supply in.
Your local electrical store should be able to sell you either a fixed 12volt supply or even a variable supply allowing 3, 6, 9 or 13 volts output. Make sure it has the amperage capacity you need. It won't matter if you need 500Mah and the supply is 750Mah as long as it isn't less than what you need.
The power supply should come with an assortment of plugs which are insrted into the socket on the end of the power supplies lead. Follow the instructions on the packaging and ensure you have the center pin set as either + or -. If you are in doubt. Take your speaker which has the socket fitted and show the salesman. He should be able to pick the correct plug and make sure it's the right way around.
If you plug it in and nothing lights up, quickly remove the plug and turn it 180 degrees in the power lead socket. Obviously it's been put in the wrong way round. If you were quick enough no damage should have occured and away you go.
Just one tip. Wrap a small piece of insulation tape around the plug to stop it from being pulled out of the power lead's socket. They do tend to work loose after a while. Oh and make sure it's switched to 12 volts if you get the variable one.
Almost without exception, the polarity of power packs is; the centre is positive (+) outside (-) In very rare cases the opposi=te is the case, but this means the outer contact is able to "short" on any metal it touches.
Do not worry about the milliamp. As long as you use an adapter thats the correct voltage (you stated 12 volts), the end connector fits into the speakers and the polarity is the same, then you wont have any trouble.