Not that I am aware of. The acoustics guy seems to be of the opinion that it is electrical from within the house, waiting for him to come up with a plan of action to trace it at present.
Will let you know if we ever find the source - its quite disturbing to see how many humming houses that are out there on the internet that have never found the source!
Will let you know if we ever find the source - its quite disturbing to see how many humming houses that are out there on the internet that have never found the source!