The 8-ohm Model AP-30 is a double re-entrant loudspeakers which deliver 30-watts of continuous power handling, superior intelligibility and unparalleled efficiency. The AP-30 Series operates within a nominal frequency response range of 300-12, 000 Hz and offers a sensitivity of 121dB at rated power to provide clear voice and signal communication. The trademarked squared-bell design signifies Atlas Sound quality and reliability. The Omni-PurposeÂ® mounting bracket (supplied on all models) achieves precise positioning in the vertical and horizontal planes with a single adjustment and includes provisions for loudspeaker installation on conventional surfaces as well as for strap mounting on I-beams or pillars. AP Series loudspeakers are U.S. made to assure superior service reliability. Weather-resistant construction is metal and matching ABS plastic with metal components finished in grey epoxy.