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Please excuse the neophyte question: When does one need to be concerned with impedance matching of speakers/receivers when buying equipment? I notice A LOT of speakers do not even make note of their impedance and neither do some receivers. I have even read on different sites that impedance matching isn't a concern for most solid state equipment. Coming from the world of mixing live sound and guitar amp/cabinet matching, impedance matching is something I am very familiar with and is often a major concern. Thanks in advance!