The Sanyo SX-825 is a bookshelf loudspeaker model that was manufactured in Japan between 1976 and 1978. It is part of a series that includes other models such as the SX-331, SX-441, SX-551, SX-661, SX-725, and SX-925. This speaker features a three-way design with a sealed enclosure and is aimed at providing a balanced audio experience. The woofer is a 25 cm cone type, responsible for low-frequency reproduction, while the midrange driver is a 6.5 cm soft dome, and there is a 3 cm soft dome tweeter for high frequencies. The SX-825 boasts impressive specifications including a frequency response that spans from 30 Hz to 20 kHz, a maximum power handling of 80 W, and a sound pressure level of 90 dB/W/m. It has a nominal impedance of 8 ohms and features adjustable level controls for both the midrange and high range frequencies. The speaker cabinet uses high density particle board and is finished with real wood veneer, contributing to both its aesthetic appeal and acoustic properties. The external dimensions of the SX-825 are 335 mm wide, 570 mm high, and 322 mm deep, with a weight of 18.0 kg, which gives it a sturdy presence. Overall, the design and build quality, along with the advanced materials used in its construction, allow the SX-825 to deliver a compelling sound experience.