If all your other equipment is 3 pronged you may create a ground loop with a 3 pronged plug on your cd player. You will notice a hum coming from your speakers when the amp is turned on. If you then use a cheater plug 3 prong into 2 prong on one of the component and the hum subsides you probably have a gorund loop. Other than that there is nothing wrong with going from 2 prong to 3 prong. Some other people who respond may be able to elaborate more on this subject. Although you can simply do a search on speaker hum(audiogon) as well as peruse the web under ground loops for more information. If you don't get a hum then I would say no problem.
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