The signal a turntable cartridge produces is tiny and fragile, which makes the RCA cable from the turntable one of the few places where cable quality genuinely matters. Good shielding and a short run keep that quiet phono signal clean.
Turntable RCA Cable: Getting the Phono Signal There Cleanly
Quick Answer / Summary: A turntable RCA cable is a shielded stereo pair that carries the low-level phono signal from the turntable to a phono preamp or amplifier input, usually with red and white plugs for right and left channels.
What the Turntable RCA Cable Carries
A turntable with a moving-magnet or moving-coil cartridge outputs a very small voltage, far lower than a line-level source. That signal travels over a stereo pair of RCA cables, one for the right channel and one for the left.
The tiny phono signal
Because the phono signal is so small and needs a lot of gain, any noise the cable picks up gets amplified along with the music. This is why turntable RCA cables are shielded, to keep hum and radio interference away from the signal.
The cable runs from the turntable’s output to a phono input on an amplifier or a separate phono preamp. Some turntables have the cable built in, while others use detachable RCA outputs.
Shielding and Why It Matters
A well-shielded turntable RCA cable rejects the electromagnetic noise that causes hum. Look for a braided or foil shield plus a low-capacitance construction, which preserves the high frequencies the phono signal depends on.
Hum and capacitance
Keep the run short, since a longer cable adds capacitance that can dull the top end and invites more noise pickup. Three feet is usually enough, and ten feet is about the practical maximum for a phono-level signal.
Route the turntable RCA cable away from power cords and power supplies, which are the main source of induced hum in a phono system.
Choosing the Right Cable
Match the connectors to your gear. Most turntables and phono inputs use standard RCA plugs, with red for right and white or black for left. If your turntable has a built-in cable, an upgrade means a turntable with detachable outputs.
Choose a cable with good shielding and quality plugs rather than spending on exotic claims. For a phono-level signal, a low-capacitance shielded cable is the practical sweet spot.
If the turntable uses a 5-pin DIN or mini-DIN connector, pick the matching cable or adapter, but standard RCA is the most common.
Connecting the Turntable
Connect the turntable RCA cable to the input marked phono, not a line input, since the phono input applies the RIAA equalization and gain the cartridge needs. Connecting to a line input gives a thin, quiet sound.
If your amplifier has no phono input, add an external phono preamp between the turntable and a line input. The RCA cable then runs from the turntable to the phono preamp, and another RCA pair from the preamp to the amp.
Attach the separate ground wire from the turntable to the ground terminal on the amp or preamp, then listen for hum and adjust the routing if needed.
Turntable RCA Cable Quick Reference
| Consideration | Recommendation |
|---|---|
| Signal level | Low phono level, needs shielding |
| Connectors | RCA pair, red right / white left |
| Length | Keep short, 3 to 10 feet |
| Input | Phono input or external phono preamp |
| Shielding | Braided or foil, low capacitance |
Real-World Application Scenarios
A vinyl listener connects a turntable’s built-in RCA cable to the phono input of a vintage receiver; an audiophile adds an external phono preamp and runs a short low-capacitance RCA pair from the turntable to it; a user routes the RCA cable away from a power strip to eliminate hum.
Recommended Internal Resources
See turntable cable for the full turntable wiring, RCA input for the color code, and left right audio cable for the stereo pair.
Frequently Asked Questions
What cable does a turntable use?
A shielded stereo RCA cable carries the phono signal from the turntable to a phono preamp or amplifier input.
Can I plug a turntable into any RCA input?
No, it must go to a phono input, or through an external phono preamp, because the phono signal needs RIAA equalization and extra gain.
How long can a turntable RCA cable be?
Keep it short, ideally under ten feet, since a long phono cable adds capacitance and picks up more hum.
Why does my turntable hum?
Hum is usually a missing ground connection, a poorly shielded cable, or the RCA cable running too close to power cords.