65 Hz to 17 kHz. The Plenum-Rated 2x2 Drop In Ceiling Speaker is specifically designed for use in K-12 classrooms to deliver high quality audio from multimedia presentations, video clips, movies and other curriculum throughout the classroom. This speaker is designed to mount in the drop-ceiling frame that is often present in classrooms. Available in an industry standard 70 volt version with a 25 volt tap, this speaker ensures long life and quality sound. The Plenum-Rated 2x2 Drop In Ceiling Speaker has 0.5, 1.0, 2.0 and 4.0 watt taps to integrate seamlessly with a 70 or 25 volt amplifier to provide a complete classroom sound system. Additionally, the speakers can be combined with the A/V controller and RapidRun® for a complete connected classroom. This ceiling mount speaker provides a clean, unobtrusive look while dispersing sound down to students at 100 degrees for full classroom coverage.