XLR Connector Cables: The Hardware Reference for the XLR Family
Quick answer / TL;DR: Short answer: standard XLR connector cables use the 3-pin connector (pin 1 shield, pin 2 hot, pin 3 cold) for mono balanced audio. 4-pin and 5/7-pin variants carry additional signals – stereo on two channels, or audio plus control or power in specialized uses. Male connectors have pins; female have sockets. Read the pin count and the gender first, and the cable specification follows.
'XLR connector cables' covers the hardware side of the family: the connectors at each end, the pin counts, the gender (male or female), and the panel and field forms that make up a permanent install. Most cabling errors are connector errors – a reversed pair, a 4-pin where a 3-pin is needed, or a panel feed wired for the wrong application – and the errors are all visible in the hardware before the cable is cut.
This reference lays out the connector variants, what each pin count carries, and how to read the hardware so the cable is specified from the connector, not the other way around.
Pin Counts and What They Carry
| Pin count | Standard use | Signal carried |
|---|---|---|
| 3-pin | Mono balanced audio | Shield, hot, cold |
| 4-pin | Stereo (two mono channels) | Two shields + two signals, or audio + control |
| 5-pin | Specialized (e.g., 2-channel + data, lighting) | Application-specific |
| 7-pin | Specialized (video + audio, some pro AV) | Application-specific |
The 3-pin is the default for audio. 4-pin is most often stereo (two mono channels in one cable, each with its own pair). 5 and 7 pin are application-specific – if the destination is not a known 4/5/7-pin device, the 3-pin is the safe specification.
Male and Female: Reading the Connector
| Feature | Male | Female |
|---|---|---|
| Contacts | Pins (protruding) | Sockets (recessed) |
| Typical position | Mic end, cable end feeding a panel | Console, interface, mic body |
| Pairing | Male plugs into female | Female accepts male |
| Count per cable | Usually one male + one female per end pair | Same |
A standard XLR cable is male at one end and female at the other (or male-to-male, or female-to-female, for specific panel work). The cable must match the genders at both physical ends – which is why the two device ends are inspected before the cable is chosen.
Straight vs. Reversed Polarity
Within the 3-pin standard, 'straight' wiring carries pin 2 as hot and pin 3 as cold at both ends, with the phases aligned. A 'reversed' pair swaps the hot and cold relationship between ends – used deliberately in some panel and speaker applications to correct a phase inversion introduced elsewhere. A reversed cable in a mic run that expects straight wiring is a phase error that reads as thin, hollow sound rather than a broken connection.
| Wiring | Pin 2 / Pin 3 relationship | Used for |
|---|---|---|
| Straight | Aligned at both ends | Mics, standard line-level |
| Reversed (phase-inverted) | Swapped between ends | Correcting an external inversion, specific panels |
Panel and Field Forms
- Panel connectors: soldered or terminal-block XLR jacks mounted in a console, wall plate, or rack face
- Field-wire cable: bulk cable terminated in the field with XLR plugs – the standard install method
- Patch cables: short, pre-terminated XLR-to-XLR for patch bays and rack patching
Per-connector pin assignments for 4/5/7-pin applications vary by manufacturer and standard; the knowledge base does not provide a multi-pin assignment matrix. Confirm the pin assignment against the specific device's manual before wiring any non-3-pin cable.
Real-World Applications
The console build
A mixing console's mic inputs are female XLR panels; the stage feeds them with male-to-female straight cables. The hardware reading – female on the console, male at the cable end – is the specification.
The wall plate install
A fixed venue runs field-wire cable to a wall-mounted XLR panel; the panel's female jacks accept the stage cables. The panel and the field cable are specified together as one install.
The stereo 4-pin run
A stereo signal (a pair of monitors, a stereo feed) travels on a 4-pin XLR cable – two balanced channels in one jacket. The destination must be a 4-pin stereo device; a 3-pin input is the wrong hardware for the cable.
Related reading: The pin-by-pin function of each pin? Read the pinout guide — blogs/news/xlr-connector-pinout
Related reading: Browse XLR cables by connector and pin count — collections/audio-cables
Frequently Asked Questions
How do I tell a 3-pin XLR from a 4-pin?
Count the pins (male) or sockets (female) – 3-pin has three, 4-pin has four in a single row or arc. The pin count is visible without a manual; when in doubt, count before connecting.
What is a male XLR?
The connector with protruding pins. A female XLR has recessed sockets. A standard cable pairs one of each; the cable is described by its two end genders.
Can I plug a 4-pin XLR into a 3-pin socket?
No – the keying and pin count differ, and the connectors are physically incompatible. A 4-pin cable requires a 4-pin socket; adapters between pin counts are a separate (and application-specific) product.
What does 'straight' wiring mean on an XLR cable?
The hot and cold pins carry aligned phases at both ends – the standard for microphones and line-level audio. A reversed cable swaps the phase relationship, used only to correct a known external inversion.
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