OMNITRONIC CST-8 is a passive 2-way flush-mount ceiling speaker for indoor 100 V public address systems. It features an 8-inch woofer and 0.5-inch swivel tweeter, providing a frequency range of 50–20,000 Hz, 87 dB sensitivity and a maximum SPL of 101 dB. The speaker supports 10 W, 20 W and 40 W RMS power tapping, and is intended for speech and background music in installations such as restaurants, hotels, bars and sports facilities. Its white metal grille has a 27 cm overall diameter and requires a 24 cm mounting opening.