Check the listing for details. Cooper Wheelock STH-15S Loudspeakers. Condition: New. Listed at 146.99 USD. The Cooper Wheelock STH-15S Loudspeakers are high-performance, surface-mount audio devices designed to provide clear and powerful sound in emergency notification systems. These loudspeakers are engineered to deliver effective voice communication and alarm signals in a variety of public and commercial spaces, such as schools, hospitals, industrial sites, and office buildings. With a high decibel output, the STH-15S ensures that alerts are audible even in noisy environments. The speakers are built with rugged, durable materials, making them suitable for both indoor and outdoor installations. They feature a wide frequency response range, ensuring intelligibility of voice messages and alarm tones. The compact design and easy installation make the STH-15S an ideal choice for use in a wide range.