How to Ground a Turntable and Eliminate Hum
As an Amazon Associate I earn from qualifying purchases.
A low, steady hum coming through your speakers when the turntable is connected is one of the most common vinyl annoyances, and grounding is usually the cure. That hum is electrical noise finding its way into the very sensitive phono signal, and a proper ground path gives it somewhere to go besides your speakers. Grounding sounds technical, but in practice it is often as simple as connecting one wire to the right place.
Most turntables that output a phono signal include a thin ground wire, usually a single lead with a spade or fork connector on the end. This wire exists specifically to drain electrical noise away from the signal path. If you leave it disconnected, that noise can show up as a persistent hum, especially at higher volumes. The wire is not part of the audio signal itself, so it is easy to overlook, but it does an important job.
The ground wire connects to a grounding terminal on your amplifier, receiver, or phono preamp, typically a small screw post often labeled ground or marked with a grounding symbol. Loosen the post, slip the connector under it, and tighten it down so it makes solid metal-to-metal contact. In most cases the hum disappears the moment the connection is secure. If your phono stage has such a post, this is almost always where the wire belongs.
Some turntables, particularly those with a built-in phono preamp and a line-level output, do not include a ground wire at all, and that is normal. These decks handle grounding internally, so you simply connect the audio cables and skip the ground step. If you still hear hum from a setup like this, the cause is likely elsewhere, such as a cable issue or interference from nearby electronics rather than a missing ground.
If grounding does not fully solve the hum, look at the surrounding conditions. Keep the turntable and its cables away from power adapters, dimmer switches, and other sources of electrical interference, and make sure the audio cables are in good condition and firmly seated. Try a different outlet or reposition the gear. But start with the ground wire, since connecting it to the proper terminal resolves the majority of turntable hum quickly and for free.