TOA PC-658R Ceiling Mount SpeakerIntegrated with a resin panel and speaker frame, the PC 658R is the ceiling mount speaker with a metal attached. It features spring clamp mechanism for easy speaker mounting to the ceiling. The input impedance can be easily changed by changing the tap position of the transformer. Specification Rated Input 6 W (100 V line), 3 W (70 V line) Rated Impedance 100 V line: 1. 7 k (6 W), 3. 3 k (3 W), 10 k (1 W) 70 V line: 1. 7 k (3 W), 3. 3 k (1. 5 W), 10 k