The Lowell ES-8TSUB produces extended low-frequency response for music, making it ideal for retail, commercial, industrial, institutional, and residential applications when used in combination with other ES Series loudspeakers. The self-contained recessed speaker system with 8-inch (203mm) driver has a ported enclosure tuned for extended low frequency response. Spacing is typically twice the center-to-center spacing as the accompanying ES Series speakers. Includes driver, transformer, enclosure, grille, mounting aids.