u/Normal-Interest-2287

I've had this receiver for about 6 ot 7 years and successfully ran AccuEQ several times. Recently I changed out the Main and Center speakers and when I run AccuEQ it goes through the process normally, but then fails with the ambient noise message.

I turned off the HVAC and refrigerator, removed a mantle clock that makes a tick-tock sound,and turned off lights on the off chance they could produce a hum. I also borrowed a microphone from a friend that has the same model receiver. Nothing makes a difference. Has anyone encountered this problem? Any suggestions are welcome.