Earphone Jack Extension: Getting It Right for In-Ears
In ear headphones are sensitive, low impedance and worn close to the body. An extension that works perfectly with over ear headphones can add audible noise and cable rustle when used with earphones.
Quick Answer
For earphones, choose a thin, flexible and well shielded extension with a slim plug, keep it as short as the job allows, and prefer cloth or soft rubber jacketing to reduce cable noise. Avoid thick stiff cable and heavy plugs, which transmit movement straight into the ear. Length beyond about three metres is rarely worth the trade off with sensitive in ear models.
Why Earphones Are Different
| Factor | Over ear headphones | In ear earphones |
|---|---|---|
| Sensitivity | Moderate | High, so noise is more audible |
| Impedance | Often higher | Usually low, so cable resistance matters less |
| Microphonics | Minor | Significant, movement noise travels up the cable |
| Plug fit | Standard barrel acceptable | Thin barrel needed for recessed sockets |
| Weight tolerance | High | Low, heavy plugs pull on the ear |
Microphonics and How to Reduce Them
What it is
The rustling sound produced when the cable rubs against clothing or a desk, transmitted mechanically into the ear.
Cable choice
Soft, flexible jackets and braided cloth covers reduce it. Stiff plastic jackets make it worse.
Routing
Run the cable under clothing and secure it so movement does not reach the earphones.
Connections
Every extra joint is a potential source of noise. One extension rather than two is better.
Practical Guidance
- Match the pole count, since most earphone headsets use four pole TRRS plugs.
- Choose a slim plug if the source socket is recessed.
- Keep the extension under three metres.
- Prefer a soft jacket over a thick one.
- Check that the socket grips firmly, because a loose fit causes dropouts.
Real-World Applications
- Reaching from a pocket to a device mounted on a desk.
- Using in ear monitors with a belt pack at a distance.
- Extending a short stock cable on premium earphones.
- Practising with earphones while the source stays out of reach.
Related Guides
For the general case, read 3.5 mm extension cable. For earbud specific cables, see earbud extender cable. For socket sizes, start with headphone jack extension cord.
FAQ
Why does my earphone cable make rustling noises?
That is microphonics, caused by cable movement. Softer, better routed cable reduces it.
Does an extension reduce bass?
Not normally. Very long, thin cable can add resistance, but the effect is small with low impedance earphones.
Can I extend a four pole earphone plug?
Yes, with a TRRS extension. Using a three pole extension loses the microphone.
What length is too long for earphones?
Beyond about three metres the noise and handling penalties usually outweigh the convenience.