Electro-Voice TS550D is a low-frequency speaker system designed for cinema stage use (behind the screen) with an extended 40Hz response. It features two EVX-150A woofers providing high peak and long-term output, making it suitable as the primary low-frequency source in two-way systems or as the subwoofer in multiway systems. With a continuous program of 2,000 watts and a side-mounted connection panel, it facilitates hookup when depth behind the screen is restricted. The optional HS6 or HS7 hanging kits provide through-the-box steel tubes for secure suspension.