If it increases, there is a system / wiring fault which must be corrected.Īssuming everything up to turntable passes, use shorting plugs on the phono input. Add each preceding component with it's inputs shorted. If there is any hum, there could be something amiss with the amp or more likely the wiring. At the absolute worst, there should only be a slight hiss with ear right next to drivers. Start with the power amp alone and shorted inputs. Noise elimination is a step by step process. Sometimes adding a ground lead from the offending gear to the next can solve the problem.īe sure everything is off when changing connections. Sometimes gear has a resistor between earth and its zero volts. Power cords should only be as long as necessary and cross audio lines at right angles. Power cords should never be coiled or bundled with audio leads. Sometimes just re-arranging power cords or component position will solve the problem. How is the gear arranged? Please list components and positions. My HiFi is connected to a copper rod that goes 10 feet into the ground. It can be due to poor design, corroded connections and silly electrical code like allowing bonding to rebar in a foundation aka UFER. Many buildings have essentially no ground. Triac dimmers are notoriously noisy and phono cartridges make excellent pickups. Hum will usually be a purer tone than a ground loop which often contains buzzy noise components. Is it hum or ground loop? They are not the same thing. If it's chassis only, removing it will have no effect. It is best to check first if the ground pin is connected to any of the signal leads. Use an adapter if you must lift a ground. Another option would be to put a very nice isolation transformer inline in the signal path breaking the XLR ground.)Īs you can see, hum can come from many different kinds of ground faults in a complex audio setup! (I don’t recommend this unless you know what you’re doing and what the source of your hum is. On the advice of an old school audio repairman who was factory authorized by brands like Luxman, McIntosh, Mark Levinson, etc, I snapped both ground pins off the (removable) power cables. It only occurred when either of the two (or both) was connected to power AND to each other via the balanced connection, right channel, left channel or both. Later, a different system with a headphone amplifier connected to a DAC with a pair of XLR cables in a balanced differential setup was getting horrendous ground hum. It turns out that cable tv/internet companies love to run coax signals extremely hot to prevent loss, especially in apartment and condo complexes. So I drove to Fry’s, bought a coaxial grounding block and ran a ground wire from the block to the ground on a wall outlet. I tried disconnecting one signal cable at a time in the system until I isolated it to the coaxial cable entering the apartment. The cable modem was connected to the same circuit as my home theater preamp and self powered speakers. Whatever your sound system design needs, Pro Audio Solutions has the technical expertise and industry experience to make your concept a reality.I had a vicious ground loop in a system that used a residential cable modem with an incoming coaxial connection. We are proud to be an Apple Authorized Reseller & Service Center, but also have extensive expertise in all things PC. At Pro Audio Solutions, you'll find a team of audio and sound experts who've worked with a variety of clients, providing superior service. We pride ourselves in standing out above other retailers of professional audio equipment because of our years of expertise in the industry, allowing us to comprehensively and more efficiently determine your audio needs and figure out the best solution to achieve those goals. Pro Audio Solutions is an authorized dealer for all top brands of professional audio equipment for a variety of sound and audio facilities.
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