Model AP-15T is a double re-entrant speakers which deliver 15W of continuous power handling, superior intelligibility and unparalleled efficiency. The AP-15 Series operates within a nominal frequency response range of 400-14,000 Hz and offers a sensitivity of 120 dB at rated power to provide clear voice and signal communication. The trademarked squared-bell design signifies AtlasIED quality and reliability. The Omni-Purpose mounting bracket (supplied on all models) achieves precise positioning in the vertical and horizontal planes with a single adjustment and includes provisions for speaker installation on conventional surfaces as well as for strapmounting on I-beams or pillars.