Audio Wire to RCA: Termination Done Properly
Line level audio is a small voltage and an even smaller current. That means the mechanical quality of the joint matters more than the conductor size.
Quick Answer
| Cable type | Structure | Suits RCA termination |
|---|---|---|
| Screened audio cable | Inner conductor plus braid or foil | Yes, the correct choice |
| Twisted pair | Two equal conductors | Workable for short runs |
| Coaxial 75 ohm | Solid centre plus shield | Yes, good shielding |
| Speaker wire | Two heavy conductors | Only for speaker level, not line level |
| Mains flex | Not screened or rated | Never |
Screened audio cable or thin coaxial is the right material. The screen carries the return, and it also shields the small signal from interference.
Termination Steps
Prepare the end
Strip the jacket without nicking the screen, then fold the screen back neatly.
Connect the centre
The inner conductor goes to the tip pin. Keep it short to avoid shorting to the screen.
Connect the screen
The screen goes to the outer sleeve. On screened cable this is also the signal return.
Check for shorts
Measure between tip and sleeve before connecting anything. A short reads as a few ohms instead of open circuit.
Stereo Pairs and Conventions
- Two cables are needed for stereo, one per channel, each with its own RCA plug.
- White or black is conventionally left and red is right, though conventions vary.
- Keeping the pair together and marking the ends avoids confusion later.
- On screened cable the screen is the return, not an earth in the mains sense.
Where It Is Used
- Repairing a cable whose plug has failed.
- Making a custom length for a rack.
- Terminating installed audio wiring at a wall plate.
- Adapting an unscreened cable temporarily for testing.
Real-World Applications
- Rack installations with custom lengths.
- Wall plates for audio distribution.
- Repairing vintage equipment cables.
- Bench testing with a known good lead.
Related Guides
For the stereo pair version, read RCA to 3.5mm. For speaker level wiring, see RCA to speaker wire. For cable types, start with RG6 coaxial cable.
FAQ
Can I use speaker wire for RCA plugs?
Not for line level signals. Unscreened heavy wire picks up interference and provides no shield.
Which conductor is the return?
On screened cable the screen is the return and also the shield.
How do I know the joint is good?
Check continuity end to end and confirm no short between tip and sleeve.
Does cable length matter at line level?
Yes. Long unscreened runs pick up hum and interference, so keep them short where possible.