Bose Speaker Problem

I have a set of Bose Companion 3 Speakers and it seem that the left channel port has a static sound too it. Ive swapped speaker to make sure of this and the speakers are fine, any suggestions? Im pretty sure my warrenty is up and if not I dont think they will replace them since they have been through a few blackouts. I also noticed that the static isnt relative to the volume no matter how high its turned up the static stays at the same level.

Try cleaning the connectors/ports. This sometimes helps, as they can get greasy/etc. Other than that, no other suggestions, sorry