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On an amplifier, rem. usually stands for remote. For an automotive audio amplifier, the remote connection could be for a gain remote. This is usually a dial at one end and a phone jack like connection on the other. This allows you to turn down the gain or volume on the amplifier wherever you wish to mount the remote. If there is a terminal (screw and clamp for attaching wires) under the rem label, then it is for remote shut off. The remote shut off for external amps for like subs or higher end speakers connects a thin blue wire from the head unit or radio to the amplifier. For head units or radios, the remote connection connects to the ignition system. Both of these allow the amplifier to shut off while the key or radio is in the off status. For Home Theater amplifiers the remote connection could be for a few things. It could be for an IR or Infrared receiver, or to be controlled from another device. These two usually is a 3.5 millimeter female jack terminal. If it looks like a 2 prong 110V receptacle, it will cut the power to another device when the amplifier shuts off.

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