The Bose 401 is a bookshelf speaker that was produced by Bose Corporation. It features a two-way design with a 6.5-inch woofer and a 2-inch tweeter. The speaker has a slim and compact design, making it suitable for small to medium-sized rooms. It has a frequency response of around 75Hz to 20kHz and is known for its balanced sound reproduction. The Bose 401 was released in the late 1980s and is often considered a vintage speaker model.