HomeBlogBlogRCA vs AUX vs Phono: What Those Inputs Really Mean

RCA vs AUX vs Phono: What Those Inputs Really Mean

Is RCA AUX or phono?

RCA is a connector type, not a signal type. “AUX” and “phono” describe different kinds of audio signals, while “RCA” describes the plug (the familiar red/white pair). So an RCA cable can carry an AUX-level (line-level) signal, or it can be used on a turntable’s phono output—what matters is the source output and the input you’re plugging into.

What “AUX” usually means

In home audio, “AUX” typically refers to a line-level input meant for devices like phones, CD players, streamers, or the line-out from many modern record players. Line-level is already amplified to a standard strength, so it can go straight into powered speakers, soundbars with analog input, or an amplifier’s AUX/LINE input.

What “phono” means (and why it’s different)

“Phono” is a special, very low-level signal coming directly from a turntable’s cartridge, and it needs a phono preamp to boost it and apply RIAA equalization. A receiver or amplifier with a dedicated PHONO input has that preamp built in. If a turntable’s output is truly “phono,” plugging it into an AUX/LINE input will sound very quiet and thin.

How to tell which one your setup uses

Many turntables and record players provide RCA outputs that are switchable between PHONO and LINE (sometimes labeled “PHONO/LINE” or “PREAMP ON/OFF”). If there’s a switch, set it to LINE when connecting to AUX/LINE inputs or powered speakers; set it to PHONO when connecting to a receiver’s PHONO input. If there’s no switch, check the labels near the jacks or the manual to confirm whether the RCA output is line-level or phono-level.

For a practical walkthrough of connecting a record player using AUX, RCA, and other common options, see the step-by-step guide here: https://ellixuro.com/guide-3-speed-bluetooth-record-player-aux-usb-rca-setup/.

FAQ

What happens if you plug a turntable into an AUX input?

If the turntable is set to PHONO output (or only has phono-level output), it will play extremely quietly and may sound tinny. If the turntable is set to LINE output, it should work normally in an AUX/LINE input.