The adverse effects of EM noise can be born in any powered gear, and then travel to the next piece of gear where the problem is compounded by more intermodulation. In this way, the audio signal’s integrity is lost. ![]() Through this process of haphazard interaction, information is added to and taken away from the component’s internal signals. This is called intermodulation distortion. Once inside, an unpredictable cacophony of HF signal interaction occurs with every internal circuit. Capacitive and inductive coupling (how an antenna receives a signal) allows any plethora of HF noise to enter your gear either (a) through the power lines, then into your gear through your power cords, or (b) directly into your power cords and into your gear. Your components are connected to power cords, and those power cords to power lines these power lines (including your power cords) not only transfer power, but also act as antennas. There is no "EM-sanctum" for us audiophiles, and our private music playback quality suffers dearly for it. ![]() Through cell towers and satellites, everybody is connected to everyone at once: real time streaming of audio and video, live desktop sharing, global conference calls, and cloud computing-all of this is spreading like wildfire throughout the aether. ![]() In the air, information carrying frequencies extend well into the multi-GHz range, bordering on infrared light frequencies. (Don't read it, we are just trying to make a point.)Īs if the proliferation of wireless technologies and the omnipresent usage of mobile devices were not enough, consider this: the power grid’s own wires are used as communication lines, and even as internet broadcasting networks, while at the same time boiling your ritual morning tea. United States Federal Regulations: HF Bandwidth Allocations in 2002
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