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The U-21S from TOA Electronics is an input module for 900 series equipment that receives unbalanced, line-level signals from devices such as CD players, AM/FM tuners, and tape decks. It allows remote control of the input signal via an external potentiometer and is also configurable as a master remote volume control. It has an adjustable gain control and screw terminals for device input.
In the Box
Toa Electronics U-21S - Unbalanced Line Level Input Module with Remote Volume Control (Screw Terminals)