XLR Mic Cable: What a Microphone Needs From Its Cable
A microphone cable does two jobs at once: it carries the signal and, for condenser microphones, it carries the power that makes them work.
Quick Answer
| Requirement | What it needs | Why |
|---|---|---|
| Balanced wiring | Three conductors wired to standard | Noise rejection on stage |
| Phantom power capable | All three pins wired, sound shield | Condensers draw 48 V through the cable |
| Flexible jacket | Soft jacket, strain relief | Cables are moved and coiled constantly |
| Robust connectors | Metal shell, solid latch | Stage wear and tear |
| Sensible length | Reach plus slack, not more | Long coiled cable is a trip hazard |
Phantom Power and the Cable
How it works
The mixer or interface puts 48 V on pins two and three relative to pin one. The microphone uses it for its internal electronics.
What a bad cable does
A cable with a broken shield or poor contact can drop phantom power, making a condenser microphone silent or noisy.
Dynamic microphones
They ignore phantom power, but a damaged cable still causes noise and dropouts.
Ribbon microphones
Older designs can be damaged by phantom power. Modern ones are usually protected, but check before enabling it.
Length and Practical Setup
- Choose the shortest cable that reaches comfortably.
- Coil over under hand to avoid kinks.
- Label cables by length for faster stage setup.
- Replace, do not tape, cables with intermittent faults.
- Test phantom power with a condenser before a session.
Real-World Applications
- Vocal and instrument microphones.
- Podcast and streaming setups.
- Stage and PA use.
- Studio recording with condensers.
Related Guides
For balanced wiring, read XLR to XLR cable. For connectors generally, see what is aux. For conversion, start with 3.5mm to XLR cable.
FAQ
Do I need a special cable for phantom power?
A properly wired balanced cable handles it. A damaged or poorly wired one may not.
Why is my condenser microphone silent?
Check phantom power is enabled, then test the cable with another microphone.
How long can a mic cable be?
Tens of metres on a good balanced cable. Keep runs reasonable anyway.
Can I use an XLR mic cable for speakers?
No. Speaker level needs speaker cable.