The PIE NF-40 in-line power supply Noise Filter eliminates noise generated by
the alternator and charging system of the vehicle.
Using the highest quality components and passive circuitry, PIE's NF power lead
filters will eliminate unwanted noise due to alternating current fluctuations,
resulting in a quiet audio system, free of alternator whine and other vehicle
noise (e.g. ignition, windshield wipers, etc.). Heavy-gauge wire leads and
heavy-duty potted enclosures ensure long-term reliability. Quick and easy to
install, just insert the noise filter in-line on the power lead to the component