In some cases, even dedicated circuits or power conditioners might not help. If the house power system is not grounded properly or there's excessive current in the neutral wiring (dimmers, fluorescents, computers, etc), or if strong external RFI/EMI is present (nearby radio towers, radar facilites, etc) then no power conditioner will help short of an isolation transformer. Power conditioners are not a cure-all; it's like saying all a wrecked car needs is a coat of wax.
