Spec Sheet Preview: The Alpha Communications® SP008 and SP008T speakers are cost effective ceiling/public address speakers. The model SP008 features a high-quality 8 ohm public address and background music speaker, with excellent voice and music response. The SP008T is the same as the model SP008, but also includes a built-in dual 25/70 volt line transformer. The SP008 series speaker is designed to be installed easily, into a standard 8-inch speaker baffle (grille) assembly.