Most dynamic mics are like speakers with 50-500 ohm voice coils, Most are not very compact
with an OD of 10MM and up to as large as 30mm.? That is at least true for ones I have.
Electret mics ar small cartridges usually 6mm to as large as 9mm?in diameter with two
terminals.? The ground is the terminal that connects to the metallic shell.
Allison
