the present invention provides an apparatus and method for filtering electrical power to and from an electrical appliance to reduce or eliminate electromagnetic interference and radio frequency interference . in one embodiment , an electrical outlet strip apparatus is provided for interconnection between an ac power source and an electrical appliance that provides transient voltage surge suppression for the appliance while substantially reducing or eliminating emi from the ac power source from reaching the appliance . additionally , the apparatus reduces or eliminates emi produced by the appliance from propagating into the ac power system . the apparatus and method utilize a multistage emi filter to filter the electrical power . in particular , the electrical power is filtered in a broadband range associated with digital subscriber line systems to provide for improved dsl system performance .