Quote Originally Posted by cchean
I use my audio setup with a Chang Lightspeed line conditioner although my house mains is not earthed.
Don't you mean your outlets are not grounded ? It would be a serious violation to not have your household electric supply grounded at the service panel/fuse box. The noise reduction technology in the Chang line conditioners will work without a ground, however, you will not have line-to-ground and neutral-to-ground surge protection, only line-to-neutral protection.