We just installed a 3 floor system where there were modules powered by 120 volts but all of the sound masking devices were fed with low voltage (I believe Class 2 wiring) above the ceiling.
Did a quick google search and it appears they are some kind of ceiling mounted special speakers and run on low voltage, correct? If so, where do these devices get power? Does EC has to install and wire them or vendor?
do sound masking devices need j-box, how they are attached to ceiling?