The Optonica SM-4000 II is a solid-state stereo receiver that was produced in the late 1970s to early 1980s. It features a robust construction and a classic design that attracts audio enthusiasts. The receiver delivers a total output power of approximately 40 watts per channel into 8 ohms. It has a wide frequency response range, typically from 20 Hz to 20 kHz. The SM-4000 II is equipped with multiple inputs allowing for connection to various audio sources such as turntables, tape decks, and external playback devices. The user interface includes a tuning dial, rotary volume control, and various toggle switches for adjusting bass, treble, and balance. Additionally, the receiver may include AM/FM tuning capabilities and a built-in phono preamp for turntable connectivity, enhancing its versatility. While the Optonica brand is recognized for its quality, the SM-4000 II stands out as a durable and functional piece of vintage audio equipment, suitable for both casual listeners and serious audiophiles alike.
