jack (audio term)
The receptor part of a connector, the hole where the plug goes. (In Europe, jack is commonly used for just the 1/4” connector as opposed to RCA, XLR and other types).
“Don’t read manuals to try and figure out a piece of outboard gear. Just turn the thing on and press every button until it sounds good. If it says not to do it, do it.”- Tom Lord Alge