Double check the connection to your FIM outlet, making sure the hot, ground and neutral are proper and secure. Remember, as you face the outlet, hot is on the right side, typically a smaller slot than the neutral. Also make sure this correct polarity extends to all outlets on that cicuit. It sounds like the polarity on your CDP might be different than the rest of your system. Your system should ideally be fed by a single dedicated outlet. If you are not sure, spring for a qualified electrician. I do not believe in cheater plugs. My system does not use them and is dead quiet
Please help I have a strange grounding problem
I recently bought a FIM 880 outlet and installed it myself. I plugged in my amp and cdp but I'm getting a fairly loud "humming" when I play my tuner only. I don't have dedicated outlets( I'm in the process of making this my next project)so I have my tuner plugged into a Monster Cable 2000 outlet which is in another outlet on the same wall.Both outlets are on the same line as when I shut off the breaker there is no power on this wall. The strange thing is when I unplug the cdp, the hum goes away completely.It only comes back when I plug the cdp back into the same outlet as my amp. Another weird thing is when the hum is there and I get closer to my amp, the hum increases in volume as if my body is acting as an antenna. I'm not a technical guy,but it appears to me that there is some kind of a loop and by unplugging the cdp the loop is taken out. I would surely like some advice on this new and strange situation. Thanks for your help and advice.