How to Wire an XLR to RCA Cable | Pin 2 Hot, Pin 3 Open

Wire the RCA center pin to XLR pin 2 and the RCA shell to pin 1, leaving pin 3 disconnected unless your gear’s manual says otherwise.

Pin 3 is the contact that turns a five-minute soldering job into an afternoon of chasing hum. Anyone who knows how to wire an XLR to RCA cable will give you the same three answers: RCA center to XLR pin 2, RCA shell to pin 1, and pin 3 left open unless the receiving gear’s manual asks for it.

The rest is mechanical. RCA is a two-conductor unbalanced connection, XLR runs three conductors in balanced gear, and the cable you build between them is a predictable compromise — which is why grounding and level notes matter as much as the pin order.

XLR To RCA Wiring: Where Each Conductor Goes

The standard assignment is pin 1 for shield and chassis ground, pin 2 for hot signal, and pin 3 for cold signal — but an RCA plug offers only two contacts, so one XLR conductor always ends up unused.

An RCA plug carries signal on its center pin and the return path on the outer shell. An XLR connector separates that return into a shield and its own cold conductor, which is exactly what a passive cable can’t reproduce.

The AES-recommended practice ties the shield to the equipment chassis rather than to audio signal ground alone, and following that at both ends keeps radio-frequency noise out of the run.

Does A Passive Adapter Balance The Signal?

No. A passive cable hands the unbalanced RCA signal to the XLR input untouched and gives up the common-mode noise rejection a true differential connection provides.

Level is the second issue. Consumer RCA gear commonly runs near −10 dBV nominal while professional balanced inputs expect about +4 dBu, so the input stage has a gap to cover. A dedicated converter handles the level shift and adds isolation at the same time.

Rane’s notes on sound system interconnection call transformer isolation the most reliable route between unbalanced and balanced equipment, since a direct connection can produce ground-loop noise or compatibility problems. Those same notes warn that phono, line, microphone, and speaker connections aren’t interchangeable — an RCA jack marked PHONO expects a low-level, equalized cartridge signal, not a line output.

Neutrik’s NA2FPMF adapter, a female XLR to RCA socket, carries signal on pin 2 with pins 1 and 3 tied to ground. That is a product-specific choice built for a device meant to feed unbalanced inputs, not a rule to copy on every cable you make.

Soldering Steps In The Order That Prevents Rework

A three-contact cable needs three solder joints, one continuity check, and heat-shrink over whatever conductor you leave open. Clear the repeat mistakes first and the build goes quickly.

These six account for nearly every failed cable:

• Swapping pins 2 and 3, which flips polarity — the channel still works, so the error hides until something sounds thin or out of phase.
• Leaving the RCA shell unsoldered, which drops the return path.
• Assuming the adapter made the signal balanced.
• Feeding a speaker or amplifier output into a line-level input.
• Tying pin 3 to pin 1 without checking whether the output is transformer-balanced or electronically balanced.
• Leaving shields or solder joints exposed where they can touch a chassis.

If the iron isn’t appealing, our tested XLR to RCA cable picks cover the premade options worth comparing before you buy.

Then work in this order:

1. Switch both devices off and unplug them.
2. Pick the direction — RCA source into an XLR input, or XLR source into an RCA input — because the pin 3 call depends on it.
3. Solder the RCA center conductor to XLR pin 2.
4. Solder the RCA outer shell to XLR pin 1.
5. Leave XLR pin 3 open unless the receiving device’s manual calls for pin 3 tied to pin 1.
6. Cap or heat-shrink the unused conductor so it can’t brush another contact.
7. Check continuity with a multimeter: near-zero from RCA center to pin 2, near-zero from shell to pin 1, no reading between pin 2 and pin 1.
8. Connect, power the source and destination, and start at low volume.

A finished cable reads near-zero on both intended paths and open between pins 2 and 1; once it plays without noise at low volume, raise the level slowly. If hum arrives with the knob rather than before it, the fault is a ground loop between AC circuits, and a properly rated isolation transformer belongs in line — never a lifted safety ground.