Hello. Sign In
Standards Store
EIA-331 1966 Edition, January 1, 1966
Complete Document
Active, Most Current
Stereophonic Headphones with 3-Contact Plugs, Polarization of
Includes all amendments and changes through Reaffirmation Notice , May 1973
Secure PDF  :
$63.00 USD
In Stock
Print  :
$63.00 USD
In Stock
Print + PDF :
$100.80 USD
You save 20%
In Stock
This Standard is intended to specify the jack and plug wiring for proper polarization and channel reproduction. It is also intended to specify phones marking for left and right when they are marked. This Standard covers only headphones using a 3-contact plug similar to Figure 1. It does not apply as such to amplifier, tuner and other equipment using the jack, but these equipments must be wired correspondingly if phones are to reproduce left and right channel, with proper polarization, at corresponding left and right ear.