Crafted from aircraft-quality aluminum, the Purist Audio Design AC Extension LE is a silent, stealth fighter against interference. Features include high-quality noise filtration consisting of multiple, layered elements. The interior of the unit is lined with a double layer dampening material as well as 6 resonator tubes that are 1.25 inch (31.75 mm) in diameter.
Resonator tubes are tuned to a frequency of 50 or 60 Hz depending on country. They help to passively filter out noises generated by electricity that is flowing through the outlet and does not limit voltage or current. Yet, it eliminates noise frequencies that are beyond these cycles.