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An audio jack and an audio plug are the same thing
1/4 inch (6.3mm) jack plug
1/8 inch (3.5mm) jack plug
BNC plug
Phono plug.
You will be able to plug in, however there is only one jack featured on this system.
in the headphone jack
A jack is a connector socket designed for the insertion of a plug. The plug can connect input, output, or auxiliary devices to the amplifier circuit.