The Optonica SM-7100 is a stereo integrated amplifier manufactured by Optonica in the late 1970s. It features a robust design, characterized by a heavy-duty metal chassis and an aesthetically appealing front panel. The SM-7100 offers a continuous power output of 80 watts per channel into 8 ohms, making it suitable for driving a variety of loudspeakers. It includes several input options such as phono (for turntables), auxiliary, and tape, allowing for versatility in connecting different audio sources. The amplifier also features a built-in equalizer for sound customization and a power meter which provides visual feedback of output levels.