When I hooked up the RCA cable to my receiver from my subamp, it began to make an audible hum. Is it defective?
Likely it is NOT defective. What you are hearing is called a “ground loop” and is caused by uneven ground potentials at various locations in your audio system. These potentials cause small levels of electricity to flow through the ground paths, which will often be amplified as a 60 Hz hum. • How do I stop it from humming? One of the first things to try is changing the outlet into which the subwoofer power is plugged. Since often a subwoofer is located away from the rest of the equipment, many times the outlet will be on a different circuit or have a different grounding point. Try connecting the subwoofer to the same outlet as the rest of your equipment via an extension cord or power strip. The next thing to check is the cable TV feed going into your system. While this at first seems like a silly idea, if you consider the web of connections in your A/V system, it begins to make sense. Temporarily unhook the main cable connection and see if the hum stops or is reduced. If it does, the ea
