Published July 29, 2026 · Reviewed by the Unbiased Advice & Insights editorial team · How we research and score
Turntable hum is most often a ground loop: connect the turntable's ground wire to your preamp or receiver. If that fails, check cables and power sources.
Why Turntable Hum Happens
Turntable hum is a low-frequency buzz that can come from several sources. The most common culprit is a ground loop, which occurs when there are multiple paths to ground between components, creating a small voltage difference that manifests as a 60 Hz hum (or 50 Hz in some regions). Other causes include electromagnetic interference from nearby electronics, poor shielding on RCA cables, or a faulty phono preamp. Even the turntable's own motor can induce hum if the wiring is not properly shielded. Understanding the root cause is the first step to silencing the noise. For example, if the hum changes when you touch the tonearm or turntable chassis, it is likely a grounding issue. If the hum is constant and unaffected by volume, it may be motor-related or from external interference.
How to Fix Turntable Hum: Step by Step
- Check the grounding wire. Most turntables have a separate ground wire (often a thin, bare or green wire) that must be connected to the grounding post on your phono preamp or receiver. If missing or loose, hum is almost guaranteed. If your turntable lacks a ground wire, you may need to add one or use a ground loop isolator. Ensure the connection is tight and free of corrosion. Some turntables use a grounding screw on the chassis; if yours does, connect a wire from that screw to the preamp's ground.
- Isolate the source. Temporarily disconnect all other audio components except the turntable and preamp. If the hum disappears, reconnect devices one by one to find the offender. Common troublemakers include cable boxes, computer power supplies, and LED dimmers. Even a nearby lamp with a dimmer switch can inject noise into the power line. Try moving the turntable to a different room or circuit to see if the hum changes.
- Improve cable management. Keep RCA cables away from power cords, especially those carrying high current. Cross power cables at 90-degree angles if they must intersect. Use shielded RCA cables of good quality. Coil any excess cable loosely, not tightly. Avoid running cables near transformers or wall warts. If you have multiple components, use cable ties to separate signal cables from power cables.
- Use a power conditioner or surge protector. Plug the turntable and preamp into a dedicated power strip or conditioner that filters out line noise. Avoid sharing the same outlet with appliances that have motors or switching power supplies. A simple surge protector may not filter noise; look for one with EMI/RFI filtering. For severe cases, a power conditioner with a built-in isolation transformer can break ground loops.
- Add a ground loop isolator. If a ground wire does not help, insert a ground loop isolator (a small transformer-based device) between the turntable and preamp or between the preamp and amplifier. This breaks the ground loop while passing the audio signal. Note that some isolators can slightly degrade sound quality, so choose a high-quality one. They are especially useful for systems where the turntable and amplifier are on different electrical circuits.
- Check the phono preamp. If you use an external phono preamp, ensure it is properly grounded and not faulty. Try a different preamp if possible. Some turntables with built-in preamps can have hum issues; switching to an external preamp may help. Also, verify that the preamp's gain is not set too high, which can amplify noise. If the preamp has a ground lift switch, try toggling it.
When to Replace Components
If you have tried all the above steps and the hum persists, it may be time to replace certain parts. Faulty RCA cables are a common cause; swap them with known good cables. A worn-out or low-quality phono cartridge can also introduce noise. In rare cases, the turntable's internal wiring or motor may be defective. If the turntable is old, the grounding wire itself may have corroded or broken inside. Consider consulting a technician or upgrading to a turntable with better shielding and a dedicated ground terminal. Remember, persistent hum can also indicate a safety issue, such as a short circuit, so do not ignore it. If you notice any burning smell or heat, unplug immediately.
Understanding Electromagnetic Interference (EMI)
Electromagnetic interference is a common but often overlooked cause of turntable hum. EMI can come from sources like Wi-Fi routers, cell phones, fluorescent lights, and even the turntable's own power supply. The phono cartridge is particularly sensitive because it generates a very low voltage signal that is easily contaminated. To reduce EMI, keep your turntable at least a few feet away from other electronics. Use shielded cables and consider ferrite chokes on power cords. If you have a turntable with a moving coil cartridge, the low output makes it even more susceptible. Some turntables have a metal shield under the platter to block motor noise; if yours does not, you can add a copper or aluminum sheet. Also, avoid placing the turntable on a metal surface that can act as an antenna.
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