The JBL 4309 Studio Monitor is a small, powerful bookshelf speaker. For detailed sound, the 1-inch compression driver is mated to a horn in advanced HDI geometry. The appearance of the unit harkens back to the JBL professional studio monitor design with the iconic blue baffle and exposed horn. Two finishes are available, including satin Walnut and Black Walnut woodgrain veneer with a matching blue or black grille.