Review on 🔊 Enhance Your Surround sound with JBL Professional JBL CSS8008200 mm (8 in) Commercial Series Ceiling Speakers, White, 8 by Catherine Buhr

For 70V commercial installations they seem to be a good base standard, or maybe a little overkill. They come with transformers, standard wiring options, relatively good sound. Keep in mind this is not a live PA performance, it is background music for large (or many) venues and an announcement. They work well and I haven't had any problems with any of them so far. The customers are happy with it and the price is right.