The Sansui AU-D 707 is an integrated amplifier that was designed to deliver high-quality audio performance with robust construction. It features a classic design typical of Sansui products from its era, incorporating a solid metal chassis and symmetrical layout to minimize interference. The amplifier uses a direct-coupled circuitry design that enhances sound quality by reducing distortion and ensuring a wide frequency response. The AU-D 707 is equipped with a power amplifier section that provides a significant output of around 100 watts per channel into 8 ohms. It also supports higher loads, capable of delivering more power into lower impedance speakers. The amplifier includes various input options, such as phono, line, and tape, making it versatile for connecting multiple audio sources. Additionally, it features tone control functions, allowing users to adjust bass, midrange, and treble settings to their preference. The signal-to-noise ratio is impressively low, ensuring clear and clean playback. Another notable characteristic is its dual transformer design for enhanced power efficiency and stability during operation. The overall aesthetic combines functionality with a classic look, appealing to audiophiles and home audio enthusiasts alike.