A 4-pin XLR connector is a locking circular connector with four contacts, used mainly for intercom headsets (Clear-Com, RTS, Telex), dual-channel balanced audio, and low-voltage DC power. In a standard intercom headset: Pin 1 = mic ground, Pin 2 = mic hot, Pin 3 = headphone common, Pin 4 = headphone hot.
Wiring a new intercom headset and unsure which pin carries the mic? Repairing a Clear-Com beltpack cable on a film set? Whether you work on stages, in studios, or on film sets, you’ve almost certainly used a 4-pin XLR connector — often without thinking about it. Because this compact connector carries audio, intercom, and even DC power, mastering its wiring is essential for headset builds and field repairs. This guide covers its definition, wiring, real-world uses, and how to choose the right one.
What is 4 Pin XLR Connector?
The 4-pin XLR connector is a professional circular connector with four independent contacts in a locking metal shell. It belongs to the broader XLR family — named for Cannon’s original “X” series, which gained a Latch and Rubber compound — alongside the 3-pin, 5-pin, 6-pin, and 7-pin variants.
Unlike the common 3-pin XLR used for balanced mono audio, the 4-pin version adds a fourth conductor — because that extra conductor enables dual channels or an independent return path, it suits intercom and dual-channel applications. Because its locking mechanism prevents accidental disconnection, it remains a fixture in live production. For all pin variants and their diagrams, see our XLR connector pinout guide.
7 Essential Facts: Why the 4 Pin XLR Is Indispensable
The 4-pin XLR earns its place for one reason above all: a single locking connector carries two independent paths — mic + headphone (intercom) or two balanced channels — where a 3-pin can only carry one.
Dual-channel capability – four pins can transmit two balanced audio channels in a single connector, effectively reducing the number of cables you need to run.
Safety latching design – latching mechanism can prevent the cable from falling off accidentally during live performances.
Industry standard form factor – is widely recognized and adopted in broadcast, theatre and film and television production.
Compatible intercom system – Most professional intercom belt packs use 4-pin XLR as the main headset connector.
High signal integrity – balanced wiring configuration minimizes electromagnetic interference and noise.
Robust structure – metal housing and high-quality contact pin ensure long-term reliability in harsh environments.
Flexible power routing – Some manufacturers use 4-pin XLR connector for DC power output of lighting equipment and special electronic products.
4 Pin XLR Wiring: Intercom & Dual-Channel Pinouts
It is important to understand the XLR pinout diagram before you start making or repairing the cable. The wiring method of the 4-pin XLR connector has not been completely unified among all manufacturers, but according to the specific application scenarios, there are common conventions in the industry.
Intercom Headset Wiring (Clear-Com / RTS / Telex)
Per Clear-Com’s official headset wiring reference, the standard 4-pin XLR mono headset pinout is:
| Pin | Function |
|---|---|
| Pin 1 | Microphone ground |
| Pin 2 | Microphone hot (+) |
| Pin 3 | Headphone common (−) |
| Pin 4 | Headphone hot (+) |
💡 Good news for compatibility: Because Clear-Com, RTS, and Telex share the same 4-pin mono headset wiring, a standard 4-pin headset generally works across these systems. However, the beltpack connector differs — a Clear-Com beltpack’s partyline (line) XLR-3 connector carries DC on the intercom line — verify the exact voltage against the Clear-Com system manual before wiring, as it differs from the headset connector.
Dual-Channel Balanced Audio 4-Pin XLR Wiring
In recording and broadcast applications that require two balanced audio channels:
| Pin | Function |
|---|---|
| Pin 1 | Channel 1 Hot (+) |
| Pin 2 | Channel 1 Cold (–) |
| Pin 3 | Channel 2 Hot (+) |
| Pin 4 | Channel 2 Cold (–) |
Because dual-channel wiring uses all four pins for audio, the cable shield is usually soldered directly to the connector shell rather than to a specific pin.
4-pin XLR Wiring Tools:
- Soldering iron (recommended 25-40W)
- Rosin-core solder
- Heat shrink tubing
- Wire strippers
- Multimeter (for continuity testing)
Comparison of 4 Pin XLR Connector with other XLR types
Among XLR variants, the 4-pin occupies the middle ground: more capable than the mono 3-pin, simpler than the 5-pin/7-pin — its defining trait is the intercom headset (mono) role. The following table gives you a quick overview:
| Connector Type | Number of Pins | Primary Use |
|---|---|---|
| 3-Pin XLR | 3 | Balanced mono audio (most common) |
| 4-Pin XLR | 4 | Intercom headsets, dual-channel audio, DC power |
| 5-Pin XLR | 5 | Balanced stereo audio, DMX lighting |
| 6-Pin XLR | 6 | Specialty audio, professional headsets |
| 7-Pin XLR | 7 | Multi-channel intercom, advanced lighting |
Because the 4-pin sits between the simple 3-pin and the more complex 5-pin, it hits an ideal balance — richer function than mono 3-pin, without the complexity of 5-pin or 7-pin. A key distinction worth remembering: a 4-pin intercom headset is mono (both earpieces get the same signal), while a 5-pin headset adds a fifth pin for stereo (separate left/right). For the full pin-by-pin reference across all variants, see our XLR connector pinout guide; for the stereo option, see our 5-pin XLR connector guide.
5 Real-World Uses of the 4 Pin XLR Connector
The 4-pin XLR shows up in five core settings — intercom beltpacks, broadcast IFB, film-set comms, dual-channel recording, and low-voltage DC lighting — with intercom by far the most common.
Professional Intercom System
This is the most common usage scenario. Stage supervisor, director, photographer and staff all rely on the use of 4-pin XLR headset connector intercom beltpack. The mainstream intercom platforms, including Clear-Com and RTS (Bosch), use 4-pin XLR as the standard headset interface.
Broadcast and TV studio
In the broadcast environment, the 4-pin XLR connector is used for the IFB (Interrupted Feedback) headset system of hosts and guests, as well as the production headset that requires the simultaneous transmission of mic and earphone signals in a single cable.
Film and video production
Photographers and boom operators often communicate with the audio department through the duplex intercom channel through the 4-pin XLR headset, while freeing their hands to focus on the operation.
On a 12-hour shoot a boom op’s 4-pin headset cable gets yanked dozens of times — the latch is why it survives.
Special DC Power Supply
Some professional LED lamps and niche electronic devices use 4-pin XLR connector to transmit low-voltage DC power. This is a subdivided but important application area, common in battery-powered lighting kits.
Dual-Channel recording
In a small recording scenario, when two balanced channels need to be transmitted through a single connection point, the 4-pin XLR connector provides a simple solution without additional adapter.
How to Choose a 4 Pin XLR Connector
Choosing a 4-pin XLR comes down to build quality, male/female orientation, and panel- vs cable-mount — plus confirming full-size vs mini TA4, which are not interchangeable.
Focus on build quality
Professional connectors (Neutrik, Verchil, Switchcraft, Amphenol) provide better contact reliability and longer service life.
The entry-level product may be available in studio, but it is more prone to failure in the high-intensity environment of live touring.
Differences between Male and Female
Male (plug): with exposed pin, usually located at the cable end.
Female (socket/jack): with embedded pin socket, usually located in the device panel or chassis end.
Difference between Panel-Mount and Cable-Mount
The Cable-mount connector is installed at the end of the cable for patch connection.
Panel-mount connector is fixed on the shell of the equipment, which belongs to the type of rack installation.
💡 Looking for a miniature 4-pin? If you need the compact TA4F/TA4M format used on wireless bodypacks, see our dedicated mini XLR connector guide — note that mini 4-pin (TA4) wiring varies by manufacturer (Shure, AKG, Sennheiser are not cross-compatible).
Trustworthy Brand Recommendations
Neutrik – industry leader with a rich 4-pin XLR product line
Verchil – Cost-effective, high-quality and affordable 4 pin XLR Connector
Switchcraft – is highly reliable and popular in the broadcast field in the United States
Amphenol – professional quality, widely used in military and broadcast fields
Frequently Asked Questions
What is the use of 4 pin XLR connector?
4 pin XLR connector is most commonly used in professional intercom headset, dual-channel balanced audio and special DC power supply scenarios. It is a standard connector in live event production, broadcast studio and film set.
Is 4 pin XLR connector compatible with 3-pin XLR cable?
Not compatible. 4-pin and 3-pin XLR connectors are incompatible with each other in terms of physical structure-the number of pins is different, and the shell shape is also different. In the absence of adapter, 3-pin cable cannot be inserted into 4-pin socket.
Do RTS and Clear-Com Use the Same 4-Pin XLR Pinout?
For standard 4-pin mono headsets, yes — Clear-Com, RTS, and Telex share the same headset wiring (Pin 1 mic ground, Pin 2 mic hot, Pin 3 headphone common, Pin 4 headphone hot). However, because beltpack and 5-pin stereo wiring can differ, always confirm against the manufacturer’s documentation before building a custom cable.
Can a 4 pin XLR connector be used for phantom power?
The standard 4-pin XLR is not designed for 48V phantom power supply. Although some custom configurations can transmit DC voltage, this is not a general standard. Always refer to the device document operation.
How Do I Solder a 4-Pin XLR Connector?
Before soldering, pre-tin each pin and wire end, and slide heat-shrink tubing onto each conductor. Solder each conductor to its pin per your application’s pinout, then once soldering is done, test continuity with a multimeter. For the full technique, see our solder XLR connector guide.
What is the difference between a 4-pin and 5-pin XLR intercom headset?
A 4-pin XLR headset is mono — both earpieces receive the same signal — while a 5-pin headset is stereo, with separate left and right channels. Because the first three pins are wired identically on both, the 5-pin simply adds a fifth pin for the second earpiece. If you need independent left/right audio (for example, program in one ear and intercom in the other), choose 5-pin. See our 5-pin XLR connector guide for details.
Can I use a mini 4-pin (TA4) connector instead of a full-size 4-pin XLR?
No — they’re physically different and not interchangeable. Because the mini 4-pin (TA4F/TA4M) is much smaller, it’s used on wireless bodypacks, not standard intercom headsets. If your device uses the compact TA4 format, see our mini XLR connector guide — and note that TA4 wiring varies between Shure, AKG, and Sennheiser.
Summary
The 4-pin XLR connector is one of the most reliable workhorses in professional audio and live production. Whether it’s an intercom beltpack on Broadway or a dual-channel audio feed in a broadcast control room, it delivers stable, noise-free performance in demanding environments.
Because mastering its wiring, identification, and selection saves time and avoids costly mistakes, it’s worth the effort — whether you’re a seasoned engineer or new to live production.
Browse Verchil’s XLR connector range, or explore our companion guides: XLR connector pinout, 3-pin XLR connector guide, 5-pin XLR connector guide, and mini XLR connector guide. For custom 4-pin XLR assemblies and bulk orders, contact our technical team.
