The JBL 500 JBL500 Bookshelf Speaker is a single speaker with an impedance of 8 Ohms. It is a wired connectivity speaker designed for use in a bookshelf setup. This speaker is part of the JBL brand, known for its quality audio products. The JBL500 model offers a clear and powerful sound output, making it a great addition to any home audio setup for an enhanced listening experience.