What is a microphone jack? A jack is a receptacle into which a plug or other input device is inserted. A “microphone jack,” therefore, can be considered the female end of an XLR cable that attaches to the mic or the mic preamp input. A mic only outputs electric signal so it has an XLR plug but not a jack.
To learn more about microphone jacks, check out my article What Is The Difference Between A Microphone Plug And Jack?
Jecklin Disc Technique:
Also known as the optimum stereo signal technique.
What is the Jecklin disc miking technique? The Jecklin disc is a baffled stereo miking technique. It has a sound-absorbing disc directly in the middle of a matched pair of omnidirectional small-diaphragm condenser mics. The mic capsules are each placed roughly 8 cm from the disc's centre and each point 20 degrees outside.
Junction Gate Field-Effect Transistor:
What is a junction gate field-effect transistor? A junction gate field-effect transistor (JFET) is a type of FET that offers very high input impedance and is suitable for extremely low-level audio applications (like with tiny electret microphones). JFETs effectively amplify a mic signal from the capsule output to the mic output.