Quick Answer / Summary: XLR snake wiring per channel: pin 1 shield/ground, pin 2 hot (+), pin 3 cold (-), with the pair twisted and the shield tied to pin 1. Female ends face the stage (mics plug in), male ends face the console. Phantom 48 V rides pins 2 and 3 on every channel simultaneously – the snake must pass it on all channels, and unbalanced gear must never be patched into a phantom-enabled channel.
Every channel in an XLR snake is the same three-wire balanced circuit you would find in a single mic cable – repeated N times inside one jacket. The wiring is simple; the conventions, phantom power and verification are where installs go wrong. This guide covers all three.
The Balanced Circuit, Repeated
One channel: two signal conductors plus shield, twisted, terminated to three pins. The twist and the differential input at the console cancel noise picked up along the run; the shield intercepts electrostatic noise and ties to pin 1 at the connector shells. A 16-channel XLR snake is this circuit sixteen times, with the pairs bundled under one jacket and the shields tied together at each end unless the build is individually shielded. Nothing about the bundle changes the per-channel electrics – which is why a snake’s channel behaves exactly like a single cable of the same wire.
Pin Convention, Stated Once
Pin 1 shield, pin 2 hot, pin 3 cold – consistent across XLR3. Reversed pins 2 and 3 invert polarity on that channel, which shows up as a thin, hollow mix when combined with correctly wired channels.
Shell-to-Pin-1 Bonding
The connector shell bonds to pin 1 so the chassis and shield share a reference. Lifting the shell bond on one end (telescoping) is an install technique for ground loops, not a portable-rig habit.
Phantom Power Across the Bundle
48 V phantom is applied to pins 2 and 3 at the console, referenced to pin 1, and travels the whole snake to the microphone. Every channel carries it whenever phantom is enabled – the snake neither blocks nor isolates it. Consequences: condenser mics and active DIs draw from it on any channel; ribbon mics and unbalanced sources must never sit on a phantom-enabled channel; and a short between pin 2 or 3 and pin 1 (a damaged connector) can pull the console’s phantom supply down across the block. The routine: enable phantom per channel, never globally, and verify with a voltmeter at the far end before patching vintage gear.
The Ribbon Rule
Ribbon mics have no phantom tolerance – a mis-patched phantom channel can deform the ribbon. Patch ribbons last, confirm phantom is off on their channels, then power up.
Phantom Drop Diagnostics
If enabling phantom on one channel drops the whole block, suspect a pin-1 short in the snake’s breakout – the supply’s current limit is being hit. Isolate by channel before condemning the console.
Verification and Fault Finding
Bench routine for a new or suspect snake: continuity and pinout on every channel (pin 2 to pin 2, pin 3 to pin 3, pin 1 to pin 1, no cross-connections), shield continuity from end to end, then a signal sweep with a tone generator and a meter. Field routine: plug a known-good mic into each channel in turn, confirm level and polarity. Common faults and their signatures: dead channel (conductor break, usually at the breakout), hum only when a device is connected (shield open), polarity inversion (pins 2/3 swapped at one connector), and intermittent crackle (a connector’s solder joint flexing).
The Polarity Check
A polarity tester or a two-mic phase check catches swapped pins 2 and 3 – the fault that survives continuity tests and ruins a mix. Check polarity on every channel of a new snake.
Breakout-First Diagnosis
Nine of ten intermittent faults live at the breakout or the connector boot, not mid-bundle. Flex-test the ends before cutting the jacket open.
XLR Snake Fault Signatures
| Symptom | Likely Cause | Test |
|---|---|---|
| Channel dead | Conductor break at breakout | Continuity, flex test |
| Hum when device connected | Shield open | Shield continuity end to end |
| Thin/hollow combined mix | Pins 2-3 swapped | Polarity tester |
| Crackle when moved | Cold solder joint | Wiggle test at connector |
| Phantom drops on block | Pin 1 short in breakout | Isolate channels, meter |
Real-World Application Scenarios
A club’s 16-channel XLR snake gets a polarity check on all channels each quarter – the swapped pin found in month nine saved a live recording. A studio’s 8-channel snake runs ribbon mics on the last two channels, phantom kept off there by policy. A rental fleet labels every channel at both ends and logs faults by channel number, turning diagnosis into a lookup.
Recommended Internal Resources
(1) Product cluster – https://zh-zong.com/productlist/ (anchor: XLR snake cables, 4 to 32 channels); (2) FAQ – https://zh-zong.com/faq/ (anchor: pinout and phantom questions); (3) Contact – https://zh-zong.com/contact/ (anchor: request custom channel counts).
Related Reading in This Series
- 4-Channel XLR Snake: The Small Rig’s Cable, Sized Right
- 8-Channel Snake: The Small-Band Standard, Spec’d and Sized
- 12-Channel XLR Snake: The Headroom Tier Between 8 and 16
Frequently Asked Questions (FAQ)
Q: What is the pinout of an XLR snake channel?
A: Pin 1 shield and ground, pin 2 hot, pin 3 cold – identical to a single XLR cable, repeated per channel and bundled.
Q: Does phantom power pass through a snake?
A: Yes, on every channel simultaneously when enabled at the console. Enable it per channel, and never patch ribbon mics or unbalanced gear onto a phantom channel.
Q: How do I find a dead channel?
A: Continuity and pinout first, then flex-test the breakout and connector boots – most faults are at the ends, not mid-bundle.