If it's only audible when your ear is close to speaker and it's not volume depended do nothing and leave it as-is.
Low level noise from spkr when nothing is playing
I need your help finding out why I am getting low level noise from my center speaker, even when nothing is playing. When I put my ear up to my center speaker I can hear low level noise. My system is made up of the following components: Sherborn 7/125A 7 channel power amplifier, Krell HTS 5.1 Control Amplifier, Faroudja DVD/CD DV-1000 player, Front Martin Logan Source Speakers, Center Krell Resolution 4 speaker. These are connected with MAC Silver PB Speaker Cables and Ultrasilver XLR cables. What can I do to test where the problem is coming from? I do not have a line conditioner. Will that fix the problem?