The Sony TC-K 717 ES is a dual cassette deck that is part of Sony's ES (Elevated Standard) series, known for its high-quality audio performance and robust construction. It features a direct drive mechanism, which enhances speed stability and reduces wow and flutter, resulting in accurate tape playback. The device supports both Type I and Type II cassettes, including Metal tape, and offers features such as auto reverse for uninterrupted listening and recording. The deck is equipped with Dolby B, C, and S noise reduction systems, allowing users to choose the level of noise reduction that best suits their playback or recording needs. It also includes fluorescent level meters for accurate monitoring of audio levels during operation. The TC-K 717 ES boasts a solid build quality, with premium components and a user-friendly interface. The model is well-regarded for its audio fidelity, making it a favored choice among audiophiles and cassette tape enthusiasts.