The Definitive Technology D7 bookshelf speakers feature a 4.5-inch BDSS woofer and a 1-inch aluminum dome tweeter. Key specifications include a frequency response of 67 Hz–21,000 Hz, a sensitivity of 85 dB, an impedance of 8 ohms, and a recommended power range of 20–125 watts. They have a bass reflex (ported) design, come in a glossy finish, and include a magnetic grille and 5-way binding posts.