Re: What's the volt & amps of Altec Lansing AVS300 2.1...
Your adapter is Part No. AVX300-A6859, Model No. 9701-00748-IUND.
Or You could get a universal that is rated for output of 18volt DC, 650ma, Center Positive.
I have used a 15volt DC, 900 ma with no problem, but I never run the volume high.
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Polarity and V are usually indicated somewhere near the plug. If not open the one with the plug, look at the wires connected to it, usually black and red, if still not clear follow one of the wires to the first connection point, if its to an electrolytic cap, the caps polarity will tell you what the polarity is at that input, the plug will be the same. The amperage really doesn't matter unless its too low, it can be much higher then rated, since trahsformers are self regulating for amperage.
I had the same problem. One day I heard two pops and the speaker, including the power light, were dead. Neither Dell nor Altec Lansing support them. They're throw-aways, unless you know a genius electronics technician.