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Yes. RCA usually identifies a connector type or an analog audio connection, while S/PDIF identifies a digital audio interface. Coaxial S/PDIF often uses RCA-style plugs, so the connectors can look identical even though the signal is different. For coaxial S/PDIF, use a 75-ohm digital coaxial cable with RCA connectors. A regular RCA lead may work, especially over a short distance, but it is not guaranteed. S/PDIF is also available in an optical version that requires a TOSLINK cable.
RCA and S/PDIF describe different things
RCA is primarily a connector format. In home audio, “RCA cable” commonly means a cable with RCA plugs carrying analog audio, such as the red-and-white pair used for left and right stereo channels.
S/PDIF (Sony/Philips Digital Interface) is a digital audio connection. It sends stereo digital audio over one connection rather than sending separate analog left and right signals. S/PDIF may be coaxial or optical.
Because coaxial S/PDIF commonly uses an RCA-type plug, the plug alone does not tell you whether the connection is analog or digital. Read the device label or manual.
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How the connections compare
| Connection | Signal | Typical cable and port | Use |
|---|---|---|---|
| Analog RCA stereo | Analog left and right audio | Two RCA leads, commonly red and white | Connect an analog output to an analog input, matching left and right channels. |
| Coaxial S/PDIF | Digital audio | One 75-ohm coaxial cable between digital coaxial or S/PDIF RCA-type ports | Connect compatible digital audio outputs and inputs. |
| Optical S/PDIF | Digital audio carried as pulses of light | Fiber-optic TOSLINK cable and optical ports | Connect compatible optical digital audio ports. |
Can you use a regular RCA cable for S/PDIF?
Sometimes. Focusrite’s cable guidance, dated September 30, 2024, says a standard RCA cable will likely transmit S/PDIF, while recommending a purpose-made 75 Ω coaxial S/PDIF cable. Shorter runs generally give a regular RCA lead a better chance of working, but compatibility is not assured.
The preferred cable is specified for 75-ohm digital transmission. Use one cable for coaxial S/PDIF; do not use the two-lead red-and-white arrangement required for analog stereo.
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Does S/PDIF use an RCA connector?
Coaxial S/PDIF commonly uses a single RCA-type connector. The same physical connector may therefore appear on an analog output, an analog input, or a coaxial digital port.
Look for labels such as COAXIAL, DIGITAL AUDIO, or S/PDIF for a digital connection. Labels such as AUDIO OUT L/R or red and white analog markings indicate a conventional stereo RCA connection. Connector shape and color are not sufficient by themselves.
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Is optical S/PDIF the same as coaxial S/PDIF?
They are two physical forms of the S/PDIF interface, and both carry digital audio, but they use different media and ports.
- Coaxial S/PDIF: electrical digital signal over a 75-ohm coaxial cable with RCA-type connectors.
- Optical S/PDIF: digital bitstream carried as light through a fiber-optic TOSLINK cable.
An optical cable cannot plug directly into a coaxial S/PDIF port, and a coaxial cable cannot plug directly into an optical port.
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What to use in common setups
Analog output to analog input
Use a standard two-channel RCA cable. Connect the red plug to the right channel and the white (or black) plug to the left channel. Both devices must provide analog audio connections.
Coaxial digital output to coaxial digital input
Use one 75-ohm coaxial S/PDIF cable. Confirm that both RCA-type ports are labeled for coaxial digital or S/PDIF, not merely analog audio.
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Optical digital output to optical digital input
Use a TOSLINK optical cable and remove any protective caps before inserting it. Both devices need matching optical S/PDIF ports.
Optical output to coaxial input, or the reverse
Use an active optical-to-coaxial or coaxial-to-optical S/PDIF converter in the correct direction. The converter changes the physical interface; a passive cable or plug adapter cannot perform that conversion.
Digital source to equipment with analog inputs only
Use a digital-to-analog audio converter (DAC) that accepts the source’s S/PDIF format and provides the analog output your amplifier or speakers require.
Quick Recap
Troubleshooting a connection that does not work
- Check the labels on both devices. Confirm whether each port is analog RCA, coaxial S/PDIF, or optical S/PDIF.
- Verify the signal direction. Connect an output to an input; two outputs or two inputs cannot establish a link.
- Use the correct cable type. Choose a 75-ohm coaxial cable for coaxial S/PDIF and a TOSLINK cable for optical S/PDIF.
- If testing a regular RCA lead, keep it short. It may work as a fallback, but replace it with a purpose-made 75-ohm cable if the link is unreliable.
- Check the receiving device’s input selection. Select the corresponding coaxial, optical, or digital input in its controls.
- Add the required converter for a mismatch. Optical-to-coaxial and coaxial-to-optical connections need an interface converter; digital output to analog-only equipment needs a DAC.
- Consult both manuals for model-specific support. The manuals determine which digital formats and connection modes each device accepts.
Common mistakes to avoid
- Assuming RCA and S/PDIF are the same thing because they can share a plug.
- Plugging an analog RCA output into a digital S/PDIF input, or the reverse, without equipment that converts the signal.
- Using a two-channel red-and-white RCA pair when the digital connection requires one coaxial cable.
- Assuming that optical and coaxial S/PDIF can be joined with a simple cable adapter.
- Expecting a cable alone to convert digital audio into analog audio.
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