The venerable 1/4" (6.35mm) phone plug has been with us for a long time – since 1878!
Something that has been around that long is bound to have a lot of different uses associated with it.
Yes, it's called a "phone" plug because...
The original use was as a convenient way to manually switch telephone lines at the central station (you know, those old-fashioned switchboard operators?).
As it relates to audio and professional live sound systems, the 1/4" plug is used for 5 primary functions:
The first four cables may look exactly the same, but they have different uses for the signal conductors in the cable.
The last one (speaker cables) can cause huge problems if you use the wrong cable in the wrong place!
Even though the connector can be the same shape and size for each of the five applications, you need to pay special attention to the cable configuration and how it relates to your equipment.
It may be helpful to see how this works by looking at the connector segments.
This could really be an exhaustive audio course topic all by itself, so I don't want to get too complicated here.
The important thing is that you need to pay attention to what your audio OUTPUT jacks are configured to deliver and compare that to what your audio INPUT jacks are expecting to receive.
Then use the right cable and connector type for the job.
If your gear sends out a left/right unbalanced stereo signal, don't plug it into a piece of gear expecting a balanced mono input. You'll lose half of your audio signal (the right channel most of the time), and you could cause some other system anomalies and noise.
If you're unsure about the gear, jacks, and signal types you're working with, read the equipment manual or do a quick Google search. You can generally find the details pretty quickly.
Hopefully that helps clear up a little confusion!
(Check out this Wikipedia entry for more history on the phone plug.)
The Church Sound Master Class video course teaches you exactly what you need to know about audio cables and loads of other important audio tips that church sound techs need to know. If you're looking for a comprehensive sound team training resource, this is the place to go.
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