Bogen's Self-Amplified Easy Install Speakers can be installed in a ceiling tile in less than a minute in any drop ceiling with standard ceiling tiles. Installation is a simple, three-step process that requires no tools. ASM1 Ceiling Speakers Features: Simply pierce the ceiling tile with the specially-designed studs, use wing nuts to secure the speaker to the ceiling, and fasten wire nuts to make the 24V DC power and audio connections No-tool installation eliminates need to cut ceiling tiles Built-in 1-watt amplifier Direct and reflected sound paths create wide dispersion angle Lightweight and durable, off-white plastic shell with paintable finish Contemporary, low-profile design O-ring seal prevents whistling and ensures smoother sound without peaks Front-mounted volume control Complies with NFPA National Code 160b for installation in plenums and other air handling spaces Complies with UL-2043 Frequency Response: 125 Hz - 15 kHz Maximum dBspl: 90 Depth: 3" from tile surface Dimensions: 9-1/2" diameter