I am running an NAD T 753 receiver into an Earthquake Sub-80 subwoofer via a normal subwoofer pre-out. The rest of my system is set up as a 5.1 unit in the usual way. Whenever I make any function changes through the receiver (i.e., muting, listening mode, etc.), I get a loud (depending on volume level) thump through the subwoofer (not the other speakers). I have been putting up with this, thinking it's normal; however, it is very annoying and I am seeking a fix.
Any help or advice would be appreciated.
What's happening is not normal. So we talked to the techs at NAD and they feel that the T 753 is likely the culprit -- there's something wrong with it, although they couldn't tell exactly what based on this information. Their recommendation is to take the T 753 into a NAD dealer for service.