The Sansui AU-D 907 X is an integrated amplifier that features an X-balanced amplifier design, showcasing advanced technology for superior audio performance. Manufactured in Japan from 1984 to 1986, this model is part of the X-Balance Series and is available in black or silver finishes. The amplifier measures 466 x 161 x 431 mm and weighs 20.5 kg. It operates with a power consumption of 370 W. The AU-D 907 X supports various input types including multiple phono configurations for both MM and MC cartridges, as well as connections for tuners, CDs, and auxiliary devices. The amplifier is capable of delivering continuous power of 2x 160 W at 8 Ohms (0.003% distortion), 2x 180 W at 6 Ohms, and 2x 250 W at 4 Ohms. Its total harmonic distortion is impressively low at 0.003%, with a frequency response ranging from 20 Hz to 300,000 Hz. The signal-to-noise ratios for phono MM and MC inputs are 90 dB and 80 dB respectively. The tone control features allow for adjustment of bass and treble up to ±10 dB, with additional loudness and filter functions. The design incorporates a balanced power supply system that minimizes distortion and improves audio quality, making it suitable for various listening environments.