The AP-30TC is a double re-entrant loudspeaker which delivers 30 watts of continuous power handling, superior intelligibility and unparalleled audio conversion-efficiency. The AP-30TC operates within a nominal frequency range of 300-12, 000 Hz and offers a sensitivity of 126dB at rated power to provide clear voice and signal communication. The AP-30TC each features an integral transformer to meet a variety of distributed system needs. The AP-30T is equipped with a versatile, 3-way, 25, 70.7, 100V line transformer. Transformer is adjustable using Atlas Sound's exclusive Vari-TapÂ® Connect Center which features a 7-position, watts / impedance selection switch. The labor saving Vari-Tap terminal is screwdriver adjustable and includes a protective cover with built-in strain relief. The trademarked square bell design signifies Atlas Sound quality and reliability. The Omni-Purpose mounting bracket (included on all models) allows precise positioning in the vertical and horizontal planes with a single adjustment and provides for installation of the loudspeaker on conventional surfaces or by strap-mounting to 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 (standard) or beige epoxy if suffixed with (C) where noted.