I cannot move the AVR to the same room because 4 of the speakers are in wall and in ceiling. I have an Onkyo 5500 amp and PSC5508 A/V Controller. Is an extension a problem? Is there a way to determine whether there is a high frequency issue and/or correct for it.
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I'm afraid this is the only approach I know of. We have already determined that longer cables will diminish the high frequencies too much because the mic level signal is much lower.