Instrument Cable: Construction and Quality Signals
The instrument cable is the most under specified part of most rigs. Its job is simple; doing it quietly is not.
Quick Answer
| Element | What to look for | Why |
|---|---|---|
| Conductor | Oxygen free copper, 20 to 24 AWG | Low resistance, durable |
| Shield | Braid, or braid plus foil | Blocks interference |
| Capacitance | Under 100 pF per metre | Preserves highs |
| Plug | Solid solder or crimp, strain relief | Survives stage abuse |
| Jacket | Flexible, abrasion resistant | Coils and uncoils daily |
Unbalanced by Design
One signal, one shield
TS carries the signal on the tip and uses the sleeve as shield return. Noise picked up along the way arrives with the music.
Why shielding dominates
Unlike balanced lines, there is no common mode rejection. The shield is the only defence.
Buffers change the maths
A buffer at the guitar drives the cable, making capacitance nearly irrelevant.
Bass notes
Bass is less sensitive to capacitance but more to handling noise.
Buying Signals
- Stated capacitance figure is a good sign.
- Warranty length correlates with build confidence.
- Check strain relief at the plug.
- Flexible jacket for daily coiling.
- Ignore cable voodoo; specs matter, myths do not.
Real-World Applications
- Guitar and bass to amps.
- Keyboard to instrument inputs.
- Effects send and return loops.
- Home studio instrument tracking.
Related Guides
For the guitar specific view, read guitar cables guide. For the cord naming, see guitar cord guide. For stereo variants, start with stereo instrument cable.
FAQ
Are expensive instrument cables worth it?
Mid range with good specs, yes. Extreme pricing buys marketing.
What capacitance is low?
Under 100 pF per metre is a sensible target.
Can I use an instrument cable for speakers?
No. Different job, risk of overheating.
Why does my cable crackle?
A failing solder joint or broken shield strand. Retire it.