To wire an XLR connector, connect the cable shield to Pin 1, the hot (+) conductor to Pin 2, and the cold (−) conductor to Pin 3, then keep the same pin numbers matched at both ends. This guide focuses on the wiring process and practical schemes: standard XLR cable wiring, XLR-to-TRS, XLR-to-RCA / TS, and 5-pin wiring. For full pin diagrams, use the XLR connector pinout guide.
Building an XLR cable and unsure which wire connects to which pin? Need to wire an XLR to a TRS jack or an RCA input? Whether you’re making a standard balanced cable or adapting XLR to another connector, getting the pin-to-pin wiring right is what delivers clean, noise-free audio. This guide walks through the XLR pinout, the standard 5-step wiring process, and the most common wiring schemes — XLR-to-TRS, XLR-to-RCA, and 5-pin. Because correct wiring matters more than fancy gear, even a beginner can build a professional cable in under 30 minutes.
Before Wiring: What an XLR Connector Does
An XLR connector is a locking circular connector widely used for balanced microphone and line-level audio. This page does not repeat the full connector background; it focuses on how to connect each conductor to the correct pin and how to adapt XLR wiring to TRS, RCA / TS, and 5-pin applications.
Learn the pin definition for XLR connectors
Before wiring the connector, confirm the standard 3-pin assignment used by most modern professional audio equipment. AES14 is the relevant AES standard for analog XLR pin-out / XLR-type polarity and gender, while the full diagram reference belongs in the XLR connector pinout guide.
| Pin | Signal | Typical Wire Color |
|---|---|---|
| Pin 1 | Ground / Shield | Bare, Black, or Green |
| Pin 2 | Hot (+) Positive | Red or White |
| Pin 3 | Cold (−) Negative | Black or Blue |
💡 Pro tip: Because some connectors mold the pin numbers into the plastic insert, always check them against the manufacturer’s documentation before wiring. The modern AES standard is Pin 2 hot. For complete pin-by-pin diagrams across all XLR variants (3/4/5/6/7-pin), see our XLR connector pinout guide.
Male and female XLR: What is the difference?
- Male XLR (exposed pins) — the output end: a microphone body, or the cable end that plugs into a mixer input.
- Female XLR (recessed sockets) — the input end: a mixer or preamp input, or the cable end coming from a microphone.
Because a standard balanced cable wires straight through — Pin 1 to Pin 1, Pin 2 to Pin 2, Pin 3 to Pin 3 — one end terminates in a male connector and the other in a female. For dedicated coverage, see our XLR male connector guide and XLR female connector guide.
Tools and Materials for XLR Wiring
For a standard solder-cup XLR connector, prepare the connector shell, balanced microphone cable, wire stripper, electronics solder, a soldering iron, and a multimeter for continuity testing. This page only covers the wiring workflow; for a complete soldering toolkit and technique guide, see the XLR soldering guide.
How to Wire an XLR Connector: 5 Steps
Step 1
Processing the cable
Before doing any operation, the boot and backshell of the joint and the anti-pull-off jacket are put into the cable. Forgetting this step is one of the most common mistakes newbies make – they can’t be re-inserted once soldering is done.
The outer sheath of the cable is stripped about 25mm (1 inch) with a stripping pliers.
Exposing the internal wires, you will see two core wires with insulating skins and a layer of bare copper shielding net.
The shielding net is sorted and tightened, and merged into one.
The two internal core wires are stripped of 5-7mm insulation skin.
Tinning the three wire heads separately – touch each wire head with a soldering iron and soldering tin until the soldering tin is evenly wrapped. This can prevent the loose core of the wire head and make the subsequent welding smoother.
Step 2
Treatment of XLR joints
Remove the end cap of the joint and expose the solder cup area.
Three solder cup (1, 2, 3) marked with numbers were found inside.
Pre-tin each solder cup for each soldering cup – a small amount of solder is first poured into the empty cup state. This can greatly speed up the subsequent welding speed and obtain cleaner solder joints.
Step 3
Solder or terminate the conductors
Connect each conductor to the correct terminal: Pin 1 = shield, Pin 2 = hot, and Pin 3 = cold. If using a solder-cup connector, make clean joints without bridging adjacent pins. For soldering temperature, tinning, solder order, cold-joint diagnosis, and rework, follow the how to solder an XLR connector guide.
Step 4
Reassemble the joint
Carefully fold the wire into the joint housing, bending gently to avoid stress on the new solder joint.
Clamping the anti-pulling clip on the cable jacket – this step is crucial. If this step is omitted, all cable tension will be directly transmitted to the solder joint, eventually leading to fracture.
Push the tail sleeve forward, tighten or fasten the fixation.
Step 5
Must be tested before use
Never use untested cables. Adjust the multimeter to the on-off detection mode:
The detection of pin 1 pair of pin 1, pin 2 pair of pin 2, pin 3 pair of pin 3 – 3 pairs of pins at both ends should show the pathway.
The detection of pin 1 pair of pin 2, pin 1 pair of pin 3, pin 2 pair of pin 3 – all combinations should show broken circuit. If there is a reading, it indicates that there is a solder bridge or short circuit.
Common XLR Wiring Mistakes (and Fixes)
| Mistake | Result | Fix |
|---|---|---|
| Forgetting the backshell | Can’t close the connector | Slide it on first, always |
| Swapping Pin 2 and Pin 3 | Phase reversal | Recheck before closing |
| No strain relief | Joints break from cable movement | Always clamp the jacket securely |
XLR Wiring Schemes: TRS, RCA, TS and 5-Pin
XLR to TRS (balanced two core) wiring method
When connecting an XLR signal source to a balanced TRS 1⁄4 inch jack:
| XLR Pin | TRS Connection |
|---|---|
| Pin 1 | Sleeve (Ground) |
| Pin 2 | Tip (Hot +) |
| Pin 3 | Ring (Cold −) |
Because this maps each balanced conductor directly, XLR-to-TRS produces a balanced mono cable. Per MediaCollege’s wiring reference: Pin 1 → Sleeve, Pin 2 → Tip, Pin 3 → Ring.
XLR to RCA / Unbalanced TS Wiring
When connecting a balanced XLR to an unbalanced RCA or TS jack (for example, a mixer output to a powered speaker or home amp), the wiring differs from the balanced method:
| XLR Pin | RCA / TS Connection |
|---|---|
| Pin 1 (Ground) | Sleeve / outer (ground) |
| Pin 2 (Hot +) | Center pin / Tip (signal) |
| Pin 3 (Cold −) | Tie to Pin 1 (ground) |
Because an unbalanced jack has no separate cold conductor, you must tie Pin 3 (cold) to Pin 1 (ground) — ideally at the XLR end. Per Majorcom’s wiring reference, this converts the balanced signal to unbalanced. ⚠️ Because unbalanced cables pick up noise, keep these runs short (under ~5 m). For a dedicated guide, see our XLR to TRS connector guide.
5-Pin XLR Wiring
The 5-pin XLR is used for stereo intercom systems and some headsets. Because Pins 1–3 follow the standard balanced wiring, only the extra pins change: Pin 4 carries the second channel’s hot (+), and Pin 5 its cold (−). If your application is DMX lighting or stereo audio, see our 5-pin XLR connector guide for full pinouts; for intercom, see the 4-pin XLR connector guide.
Frequently Asked Questions
Is it difficult to wire an XLR connector for the first time?
No. Most first-time users can complete a basic 3-pin XLR cable if they follow the pin assignment, assemble the connector parts in the correct order, and test continuity before use. The soldering quality still matters, so use the dedicated soldering guide for joint technique.
Can I wire an XLR without soldering?
Yes, some XLR connectors use screw terminals or other solderless termination styles. However, solder-cup XLR connectors are still common in professional cable assembly. If using solder-cup contacts, follow the solder XLR connector guide for temperature, tinning, and joint inspection.
What will happen to pin 2 and pin 3?
The signal will produce phase inversion. It may not be obvious when used alone, but when the cable is used in conjunction with other correctly wired cables – for example as a stereo pair or when mixed at the mixing station – there is a low-frequency offset, and the sound becomes thin and hollow.
Which wire should be connected to pin 2 of XLR?
According to the AES standard, pin 2 is the hot end (+), which usually corresponds to the red core wire in most balanced microphone cables and is the positive electrode of the differential balanced signal.
Do I need expensive cable to get good XLR wiring results?
Not always. For most microphone and line-level audio runs, choose a balanced shielded cable with flexible jacket material, reliable shielding coverage, and conductors that fit the connector solder cups or terminals. Cable construction, strain relief, and continuity testing matter more than brand name alone.
How do I wire an XLR to an unbalanced RCA or TS jack?
Connect Pin 2 (hot) to the center/tip, and tie Pin 3 (cold) to Pin 1 (ground), then to the sleeve. Because an unbalanced jack has only signal and ground, the cold conductor must join ground — ideally at the XLR end. Because this becomes unbalanced, keep the cable short to minimize noise.
What’s the difference between wiring and soldering an XLR connector?
“Wiring” refers to which conductor connects to which pin (the scheme); “soldering” is the technique of making those joints. Because correct wiring without good soldering still fails, master both: use this guide for the pin-to-pin schemes, and our solder XLR connector guide for soldering technique, temperature, and avoiding cold joints.
Summary
Wiring your own XLR connectors saves money, extends cable life, and gives you full control over every connection. Once you’ve mastered the 3-pin pinout, the standard wiring schemes, and clean soldering, you can confidently repair or build any cable.
Whether you’re fixing a damaged stage cable, building custom harnesses, or adapting XLR to TRS or RCA, following the schemes above keeps every connection clean, reliable, and durable. Because good wiring and good soldering go hand in hand, pair this guide with our solder XLR connector guide for technique.
Browse Verchil’s XLR connector range, or explore our companion guides: XLR connector pinout and XLR to TRS connector guide. For custom XLR cable assemblies, contact our technical team.
For crews building their own cables between shows, this is the skill that keeps an inventory repairable instead of replaceable. Verchil treats keeping a touring cable inventory serviceable as part of the wider stage box and rack picture.
