The Sony TC-K 815 S is a cassette tape deck produced in Japan between 1994 and 1996. This model features a sleek black design and operates using three motors (capstan motor, winding motor, and mechanical system motor). The deck supports an automatic detection of Type I, II, and IV tapes, which is shown on its display. It utilizes a dual capstan drive with a sapphire beared tone shaft, providing enhanced stability and sound quality. Users can perform manual tape calibration utilizing an integrated test tone generator for bias and level adjustments. The TC-K 815 S includes a range of audio features such as Dolby B, C, HX-Pro, and S encoding, along with a multiplexer filter. The deck has a frequency response of 20-20,000 Hz for Type IV tapes when Dolby is off, and exhibits a signal-to-noise ratio of 61 dB for Type IV tapes. The practical elements include a VU meter with graphical level limiting, an electronic counter for real-time tape tracking, and a headphone output with adjustable volume control. Additionally, it has a timer-controlled playback and recording feature, along with a REC Mute function for automatic insertion of blank spaces. The unit can be controlled remotely with optional accessories, and it has a power consumption of 21 watts. It measures 430 x 123 x 306 mm (WxHxD) and weighs approximately 4.9 kg.
