Hi Bill,
Strange problem indeed, especially given that it wasn’t present for a year or so with essentially the same system.
I don’t think we can say at this point whether the problem is caused by interference from airborne RFI or by effects of the HVAC on the AC power. Or whether what may have changed or degraded relative to when the problem didn’t exist is in the audio system or the HVAC system.
The only suggestions that occur to me at this point would be to perform the following experiments:
1)See if the problem occurs with the iFi reclocker removed from the system.
2)If you have power supplies that can be temporarily used in place of the two 9 volt linear supplies you mentioned, give them a try.
3)If practicable, try to determine if the problem occurs when the volume control on the 2170 is turned all the way down. Perhaps some circuit point in the 2170, or a cable that is connected to it, is picking up airborne RFI when the HVAC system turns on, which is then amplified by the power amp section of the 2170 and in turn inducing a transient at an upstream circuit point.
4)Determine if the problem occurs when the HVAC system turns on for heating purposes, for cooling purposes, for fan only purposes, or for some combination thereof.
Good luck. Best regards,
-- Al
Strange problem indeed, especially given that it wasn’t present for a year or so with essentially the same system.
I don’t think we can say at this point whether the problem is caused by interference from airborne RFI or by effects of the HVAC on the AC power. Or whether what may have changed or degraded relative to when the problem didn’t exist is in the audio system or the HVAC system.
The only suggestions that occur to me at this point would be to perform the following experiments:
1)See if the problem occurs with the iFi reclocker removed from the system.
2)If you have power supplies that can be temporarily used in place of the two 9 volt linear supplies you mentioned, give them a try.
3)If practicable, try to determine if the problem occurs when the volume control on the 2170 is turned all the way down. Perhaps some circuit point in the 2170, or a cable that is connected to it, is picking up airborne RFI when the HVAC system turns on, which is then amplified by the power amp section of the 2170 and in turn inducing a transient at an upstream circuit point.
4)Determine if the problem occurs when the HVAC system turns on for heating purposes, for cooling purposes, for fan only purposes, or for some combination thereof.
Good luck. Best regards,
-- Al