You've seen them in every electronics drawer in America: the cluster of three RCA cables, color-coded yellow, red, and white. They've been carrying audio and video signals since 1940 (yes, 1940), and despite HDMI taking over modern home theater, RCA refuses to disappear.
Here's why these three cables are still everywhere, and what each color actually does.
What does each color do?
The standard 3-cable RCA bundle splits a video and stereo audio signal across three connectors:
Yellow — Composite video — Carries the entire video signal (luminance + chrominance + sync) in one cable. The yellow plug is the easiest way to identify a composite video connection. Resolution maxes out at 480i for NTSC (North America) or 576i for PAL (Europe).
White (or Black) — Left audio channel — One half of stereo audio. The white plug is convention; some older cables use black for left channel.
Red — Right audio channel — The other half of stereo audio.
There's also a 5-cable RCA bundle for component video that uses different colors:
Green — Y (luma + sync) — The brightness/grayscale signal plus sync timing. Blue — Pb — The blue color difference signal. Red — Pr — The red color difference signal. Plus the white and red audio cables.
Component video supports much higher resolutions than composite — up to 1080p — and was the highest-quality consumer analog video standard before HDMI took over. You'll find component video on DVD players, early Blu-ray players, older game consoles (Wii, PS3, Xbox 360), and some HDTVs.
The RCA connector itself
The RCA connector (also called a "phono plug") is one of the most common connectors in consumer electronics. It uses a center pin surrounded by a metal sleeve — the simplest possible coaxial connection. The connector is named after the Radio Corporation of America, which introduced it in the 1930s for connecting phonographs to amplifiers.
RCA connectors are simple, cheap, and reasonably reliable. The downside: they're unbalanced (more susceptible to interference) and have no locking mechanism. Long RCA runs can pick up hum and noise, which is why pro audio uses XLR (balanced) instead.
Where RCA cables are still used in 2026
You'd think that with HDMI everywhere, RCA would be obsolete. It isn't. Here's where you'll still encounter RCA cables:
Older AV equipment — Receivers, amplifiers, cassette decks, turntables, CD players, and VCRs from the 1990s and 2000s use RCA almost exclusively for audio connections.
Subwoofer connections — Even modern subwoofers typically connect to receivers via a single RCA cable (the LFE/Sub Out jack).
Phono (turntable) inputs — The vinyl revival means turntables are popular again. Most turntables output via RCA cables to a phono preamp or amplifier with a phono input.
Pro audio interfaces — Many studio interfaces include RCA inputs for connecting tape machines, CD players, and vintage equipment.
Video surveillance — BNC connectors (similar to RCA but locking) are standard in CCTV, but lower-end systems use RCA for composite video monitoring.
Mixing boards — Many mixers include RCA inputs for "tape" or "CD" connections.
Karaoke machines, older game consoles, and educational equipment — Schools, churches, and entertainment venues frequently have legacy gear with RCA inputs and outputs.
Aftermarket car audio — Car amplifiers and signal processors connect via RCA.
Common RCA cable types
3-cable composite + stereo audio — The classic yellow/white/red bundle. Used for connecting older DVD players, VCRs, game consoles, and similar to TVs with composite inputs.
Stereo audio (white + red only) — Two RCA cables for connecting amplifier outputs to receiver inputs, or for connecting CD players, tape decks, etc.
Single RCA cable — Used for subwoofer connections, mono audio, or single-channel applications. Often called a "subwoofer cable" when sold for that purpose.
Component video (5-cable: green/blue/red + white/red) — For high-quality analog video up to 1080p.
Coaxial digital audio (single RCA, often orange) — Carries S/PDIF digital audio between equipment. Looks like a regular RCA cable but is impedance-matched for digital signals.
RCA to 3.5mm adapter cable — Connects RCA outputs (from a receiver, for example) to a device with a 3.5mm input (like a portable speaker or computer).
RCA-to-HDMI converters
If you have a legacy device with RCA outputs and want to connect it to a modern TV with only HDMI inputs, you need an active converter, not a simple adapter.
These converters take the analog composite or component signal and convert it to a digital HDMI signal. They typically include scaling (upconversion) so a 480i composite signal displays cleanly on a 4K TV. Powered via USB.
Quality matters: cheap converters can introduce noise, color shift, or audio sync issues. For VHS digitization, retro game preservation, or watching old DVDs, look for converters with proper deinterlacing and scaling.
Buying RCA cables
For most applications, basic RCA cables work fine. Things to look for in quality cables:
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Twisted pair construction for stereo audio (reduces interference between left and right)
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Shielded conductors to reject noise from nearby power cables
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Gold-plated connectors for long-term corrosion resistance
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Strain relief at the connector to prevent the cable from breaking at the plug
For runs over 10 feet, especially in environments with EMI (near power cables, fluorescent lights, motors), choose double-shielded cable.
At Kentek, we carry RCA cables in 3-cable composite, stereo audio, single-cable subwoofer, and component video configurations, in lengths from 3 to 25 feet. All cables are shielded with gold-plated connectors.