The 5552 speaker is a high-efficiency, double re-entrant loudspeaker that delivers 15 W of continuous power. It is suitable for use in fire alarm and life safety applications and is UL 1480 listed as a fire protective signaling speaker. The 5552 speaker includes a versatile, two-way, 25/70.7 V line transformer that meets a variety of distributed system needs. The transformer is adjustable by means of a convenient seven position, watts/impedance selection switch that is screwdriver adjustable and includes a protective cover with built-in cable strain relief. The 5552 speaker includes a mounting bracket that, with a single adjustment, provides positioning in both the vertical and horizontal planes. It also allows the 5552 to be installed on conventional surfaces or strap mounted on I-beams or pillars. Durable epoxy-coated metal and ABS plastic components are weather-resistant suitable for indoor or outdoor use.