XLR waste of time ?

would it be worth it to use a set of cardas adapters, rca to xlr , in order to run my simaudio lp3 into my ayre K5x-e balanced preamp xlr input instead of the rca input im currently using ? thanks .
Yes, it's a waste of time. The adapters don't create a true balanced signal, and the result is the same as a single ended RCA connection. I don't know the K5x-e, but if it is truly balanced then the RCA inputs are basically wired as internal XLR adapters anyway.