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Higher voltage then required is not so recommended, internal circuit may over voltage driven. some power amp max limit may fall within 18V only. See this link If your speaker power less then 30w you can choose 15V 2A will do or else select higher spec.
There should be ONE stereo miniplug to be connected to the headphones output of the computer, and one power supply plug to be connected to the AC adapter. These speakers do need a power supply, since they have an internal amplifier.
at most electrical stores you can buy a universal power adaptors with a selection of socents to fit most connections. and which has a selector on it for various voltages settings. take one of the little connectors and see which one fits. then checking the polarity on your device set the polarity the same when plugging the connector into the power supply cable. adjust voltage as needed.
Warning: when connecting a variable power adaptor alway connect on the lowest voltage setting and work up as too high voltage can distroy your appliance.
Having some trouble finding any info online about them. Did they have a large power pack that plugged into the wall? If so, there might be some information either right around where they plugged in (im assuming on the sub) or possibly on the product info sticker on the speaker. Make sure if its a round plug in that you look for the tip information (whether if is a positive tip or negative). You might be better off buying a new set, depending on the price of a new adapter, compared to the price of a new set. Let me know if this helps.
More than likely the power supply switching transistors have fried. Also check the large caps in the primary side of the power supply. If you don't know what your are doing do not attempt to fix the power supply.. very dangerous voltages involved !!! Send it to Klipsch for repair or purchase a Bash replacement panel http://www.parts-express.com/pe/showdetl.cfm?Partnumber=300-750
The problem are worsen that before. It is wisely to replace both left and right amplifier
IC, but make ensure that the power supply feed a good amount of voltage to amplifier,
Also a strong good signal. Be sure to measure it.
Altec no longer makes the power supply. However you can find used ones on eBay for about $25. I went to my local electronics store and bought an 18V, 2 amp power supply for $14. It works great and charges the iPod just like the OEM power supply. The store I purchased it from is JK Electronics in Westminster, CA 714-890-4001.