Spec Sheet Preview: The Alpha Communications® RB8SP speaker is a cost effective ceiling (or wall mount) speaker and baffle (grille) combination. The model RB8SP features a high-quality 8 ohm public address and background music speaker, with excellent voice and music response. The RB8STP is the same as the model RB8SP, but also includes a built-in (dual voltage) 25/70 volt line transformer. The RB8SP series speaker is designed to be installed easily, right on the surface of a ceiling or onto a wall. …