The speaker used in the SD72W is the next generation of Atlas high performance cone loudspeakers, the speaker is a dual cone, 25 watt 8" loudspeaker with a 10oz. ceramic magnet. It includes a curvilinear, treated paper cone for lower harmonic distortion. The loudspeaker is also equipped with a full 1" diameter copper voice coil with a black anodized aluminum former for better power dissipation. Package includes factory installed 25/70.7V line matching transformer with tap selections ranging from .25 to 5 watts.