I need to now the polarity of my Compaq Computer Speakers, Serial No. CT:D1B7C01G7J9B7Q. I have lost the original power source cord and have purchase a univeral power cord and need to know the polarity so that I do not damage my speakers when I plug it in.
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If your old monitor was a Compaq, it had slots for the speakers to hang on and provided the power for the speakers. The speakers still got their input from a cable that plugged into the computer sound output jack. If those speakers are the style Compaq supplied when I worked at a Compaq service shop, they originally came with metal stands that fit into slots on the back so you could stand them up on their own, and a 12-volt power adapter so you could use them without the monitor. If you don't have those pieces, you can buy a suitable power adapter (12 volts DC at 1 amp) at Radio Shack but the speaker stands are hard to find. You could try eBay, or just make a holder of some kind. (A friend of mine used those little wooden stands you can buy to display plates to hold her speakers when she got a new monitor. They worked out pretty well.)
Or you can replace the speakers. A new set would have everything you need. But those Compaq speakers sounded pretty good, so if they're still working you might want to keep them.