Hum, hum, baby—When the record player doesn't just play music

Vinyl. That soft crackle before the first note. The warm dynamics. The authentic sound. Everything could be so wonderful— if it weren’t for that darn hum.

A low-frequency “Brrrrr” that just won’t go away—whether Miles Davis is just coming in softly or Lemmy is cranking it up. But don’t worry: you’re not alone. This phenomenon is as old as the turntable itself—and the causes are varied. But: it’s fixable.

What exactly is this hum?

Among hi-fi enthusiasts, it’s often referred to as“phono hum.” This refers to a mostly constant, low-frequency noise coming from the speakers—even when no music is playing. Typically, you hear it most during quiet passages or when turning up the volume while the system is idle.

The reason: A turntable operates with extremely low signal voltages. Even the slightest interference is amplified—and that’s exactly where the humming problem begins.

Common causes—and how to identify them

• 🎯 Missing or defective ground cable: The classic issue. If the small cable connecting your turntable to the amplifier isn’t plugged in or is broken, the system builds up an electrical charge—and discharges it in the form of a loud hum.
• 🔌 Poor-quality or excessively long RCA cables: Especially with budget turntables, the included cables aren’t well shielded. Long cables without proper shielding act like antennas for interference signals.
• 🔄 Ground loops caused by multiple devices: If several devices are grounded (e.g., amplifier + PC + TV + turntable), a so-called “ground loop” can occur—resulting in annoying hum.
• ⚡ Nearby power sources: Power supplies, fluorescent lights, or power strips located directly behind the turntable are a common but often overlooked source of interference. Tip: Never place the power supply directly under the tonearm!
• 🪛 Loose connections or plugs: Oxidized RCA jacks, wobbly adapters, or plugs that aren’t fully inserted can also cause humming.
• 🎚️ Phono vs. Line? If you plug your turntable into a line input without a phono preamp connected first, you’ll not only get insufficient volume—but also hum. And lots of it.

The quick test: How to pinpoint the hum

Try this:

1. Turn on the amplifier and let the turntable run.
2. Turn up the volume—no sound, but hum? ✅ The problem is somewhere in the signal path.
3. Unplug the ground cable—does the hum get louder? Then the ground connection is missing.
4. Move the plug slightly—does the hum change? Then it’s a contact issue.

🔍 Pro tip: Try holding the RCA cable against a grounded metal surface with your hand. Does it get quieter? Congratulations: You need a ground connection!

No hum—here’s how to get the peace and quiet back

• 🛠️ Connect the ground cable correctly —always to the amplifier’s ground terminal.
• 🎧 Use high-quality, shielded tonearm cables —e.g., the Viablue NF-S5 phono cable.
• 🔌 Isolate power circuits: Power the turntable separately if possible—ideally through a clean power filter.
• 🔄 Avoid adapters and connectors: It’s better to use one good cable directly than ten workarounds.
• 🔇 Use the phono preamp correctly: Line ≠ Phono. Please only combine what belongs together.

Fun Fact: “Hum” as a stylistic device

Some sound designers deliberately use 50-Hz hum in movies or ambient tracks to build tension—as a subliminal sense of unease. Ironic, isn’t it? You certainly don’t want that in your hi-fi system.

Klangheimat Conclusion: If it hums, you lose—but only for a moment

Hum issues with turntables are annoying, but almost always solvable. With a little technical attention, a high-quality cable, and a proper ground connection, peace will return to your living room. And then all that’s left to do is: drop the needle, sit back, and enjoy the music.

And if there’s still a bit of hum, get in touch with us—we know a few more tricks 😉