Does the NAIT5i produce the same hum when you connect another source? Does the Pioneer produce the hum when connected to another amp, TV, etc....? Could the television/monitor produce some feedback through the video or audio connections? Are you using multiple audio outputs on the Pioneer? Do you have any kind of "conditioner" or "protector"?
I know this doesn't answer your question, but after 20+ years of doing custom systems, I've had to do my share of trouble shooting with such issues.
You might read the Naim manual to make sure the settings are right. I have designed/installed several Naim systems through the years it seems like there are some settings on the NAIT that allow preferences such as RCA and DIN connections.
Also look at the video settings and connections on the Pioneer. Video outputs can have a lot of audio problems when not setup or hooked up correctly. Don't rule out the fact that there could be a technical issue with the Pioneer and/or video system.
http://www.naimaudio.com/support/manuals
Here is a link to the Naim manual site. I hope it works out for you.
I know this doesn't answer your question, but after 20+ years of doing custom systems, I've had to do my share of trouble shooting with such issues.
You might read the Naim manual to make sure the settings are right. I have designed/installed several Naim systems through the years it seems like there are some settings on the NAIT that allow preferences such as RCA and DIN connections.
Also look at the video settings and connections on the Pioneer. Video outputs can have a lot of audio problems when not setup or hooked up correctly. Don't rule out the fact that there could be a technical issue with the Pioneer and/or video system.
http://www.naimaudio.com/support/manuals
Here is a link to the Naim manual site. I hope it works out for you.